Automotive Wiring Diagrams & Service Info (2023)


The question I get asked the most is "Where do I get all of my free wiring diagrams and service information?" Well I wish it was free! The truth is, just like any other shop I pay hundreds of dollars a month just for service information, not including OEM and aftermarket scan tool subscriptions. The good news is, DIY options and OEM short term subscriptions are available to you! Is it free? Nope.... -Enjoy!

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South Main Auto Repair
47 S. Main St
PO Box 471
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.


Hey, there viewers and welcome back to the self made auto channel, uh, more often than not.


I get emails messages hit up on the insta.

If that's a thing people wondering where I get service info, where do you get your wire diagrams? How do you know where this circuit goes? How do you know where that connector is located? You know, where are you getting these pictures? You know and more importantly, they want to know if they're free.

Unfortunately, in in my business in a in a professional shop, setting, those items are not free.

I pay hundreds of dollars a month in subscriptions.

The two main ones I use are mitchell pro demand and identifix along with other factory service info, which none of those are free.

Um, if you're looking for something free and you're in a more populated area, not downtown podunk boca, check your local library.

A lot of bigger, libraries have resources available, uh, sometimes they have full subscriptions to pro demand and all data and other.

You know, like motor, uh, repair manuals and stuff that are online where you may just have to pay for.

You know, printing out copies, which is ultimately cheaper than you know, buying the program in most cases and some of these bigger info providers like all data and mitchell offer a diy version where you can buy them vehicle specific I'm, not going to go into specific details of those programs you'll check it out yourself.

A lot of them have trial versions I'll show you where to find the links to those where to find the links to oem service info, which anybody can get you don't have to be a repair shop.

You know, or in new york or um.

So we'll, just we'll, just cut right to the chase we'll get right on here.

One of the most valuable websites you can have here is the it's your national automotive service taskforce.

And then you come down to subscription prices, which is already where we're at.

And you can scroll down through here because it's going to have great links and stuff where you know it will tell you, uh.

What the current subscription rate is and it's going to be subscriptions to factory service info.

If you get into uh programming, a lot of time, you know, those are different subscriptions, but let's say, you know, for example, you're working on your chevrolet and you're like I need a diagram from a chevy because it's broke imagine that then you come down to gm and it's, 20 bucks for 72 hours, 40 dollars per vin and that's going to be programming your factory scan tool.

If you have a interface device, you know, 55 dollars gives you three days and uh, you know, honda, you come down here.

Hon it's, 10 bucks, 72 hours and you're going to get factory service input, you're going to log into honda's website and you're going to have your wire diagrams you're going to have your, uh, you know, all your specs your your torque specs.

You know how to change your brakes wire diagrams connector pin outs, everything, you know, same thing.

Uh, you know with chrysler, um, you get on.


The dealer connector.

I can't think of the name of it.

Currently, um, you know, ford or if you're home working on your bentley, you know, 35 bucks gives you two days to your your bentley access.

So these are hyperlinks to those sites, or you can just come up to oem service websites and we'll go there and let's say you want to work on your chevrolet.

You go to acdelco.tiss you're, probably going to have to create a login.

Um, I probably picked the only website that's, not functioning right now.

Acdelco sometimes has some issues we'll call them.

So we'll, see if this loads up and it does.

So you know here we've got our programming tab, which we don't want because we're just looking for service info, um, where service info right here three days for 20 bucks gives you bulletins, repair manuals.

Service, manuals, owner's, manuals.

All that come over here.

Boom, you select it.

You pay, 20 bucks.

And if you're, if you think the 20 isn't worth it, then it's probably not worth working on your car.

20 is going to save you a lot of guessing.

You know, for example, you got a bad fuse.

And you want to know what circuit it feeds.

20 bucks is pretty cheap.

If you think you have the ability to fix, it it's going to be a whole lot cheaper than paying a shop.

You know, providing you have the ability to move forward and carry out certain tests? Uh.

So this is just one example here, um we'll.

Go back, you know, it's, you know, yeah, tech authority, that's.

What I was thinking of, you know, you want to go to chrysler click on chrysler it's going to shortcut you there.

Same process.

All the websites are a little different, um you're going to have to find.

You know, how do I log in? How do I create an account? Am I buying just service info? Am I buying programming info because a lot of like, I say, they're, often separate, I don't know why my internet's being so stinking slow, um, you know, but they're they're.

All here all your major makes.

I mean, you're working on your jaguar, baby, it's, all there, um, you know here everybody it's all here.

So these are all going to be links to oem service, info that's going to be the best service info.

You can get in my opinion.

Tech authority is still loading up.

So here it is there's.

My login name and my super secret, password don't worry because chrysler has about a 75-step security access to get in to even use the oem scan tool, uh, which sucks, but you know, everything everything you want is it free? Absolutely not you're gonna have to pay for it so there's that make a link to that tons of stuff on their site.

But most importantly, uh, for this video is, you know how to get oem service info other options for you.

You've got all data diy so all data makes a repair service info program that is for professionals.

And they also have their diy one.

You want to check it out and see how it works.

Go to their sample vehicles I'm, not an all data user.

So I'm going to be fumbly on here.

But I guess we click this one, and then you know, all your stuff's over here.

I don't know how their stuff is laid out a lot of guys really love all data.

I've been a mitchell pro demand user since since it came on cds.

So since the 90s, I've been using protonate, so I can just navigate it quicker.

So there's that you have to look to see what their what their cost is.

Usually it's, pretty low for what it is I'm, not even going to pretend to sit down here and find it buy.

Now there we go.

We'll click, buy now first vehicle, 30 bucks for an entire year.

So let's say, you have a fleet at home of three or four vehicles.

And you know, you want to you're working, you know, two of them are under warranty, but two of them, you know, you're, pulling wrenches on buy both those vehicles have all the service info.

You know, figure it out 50 bucks for five years.

That's, 10 bucks for an entire year to have the information that we have here the shop.

And I say that with a grain of salt, because I don't know if that's true, but uh, check into that, you know, see if it has what you need first does it have your wire diagrams? Does it have your specs? Does it have component tests, you know stuff that you want to know that you're struggling to find on google it's worth the 10 bucks a year and all data, not a sponsor, their direct competitor mitchell1, uh links, you know up here.

You can use this

This is mitchell pro demands version of the diy.

This is the same.

This is what I use in the shop is mitchell.

Protoman, very useful.

Um has, you know, good information.

If you guys see me pull stuff up on my screen, it's, usually from protoman or identifix.

So you go there, you can demo this too do I like it? Uh, you know, I don't know, go out and check it out for yourself, uh, I don't use it.

So I don't, I don't really know, maybe I should be an affiliate before I tell you guys, um.

But anyway, I mean, what are they? What do they state? You have tsbs, recalls, estimator maintenance repair wiring diagrams.

Um, you know, go ahead and check it out one month, 20 bucks four years.

You know, you're back to that, almost, you know what eleven dollars eleven dollars a month, eleven dollars.

And you know, twenty some cents whatever it is a dollar more than all data.

So check it out, uh, that's, a great place where you can get information.

Other ones that are available in, you know, professional shops.

Mortal logic is pretty popular.

I don't know if they have a diy version that I don't know, but that's another source of service data beyond oem data.

Of course, mitchell pro demand professional source.

I think I pay like a buck 85 a month for this and then identifix another.

You know, very popular source.

This is a silver bullet program you type in what's wrong with your car.

It gives you the top 10 parts to change.

And you just start shooting parts at it, or you can use it like a normal person and go through.

And they have service info.

They have estimated program.

They have all your specs it's.

Not just a silver bullet program, although that's mostly what it's used for, um, you know, it's, not how we you know, that's, not how I like to use in my shop, they have a lot of oem diagrams color, diagrams motor diagrams, a lot of different a lot of great stuff on here.

And then most of all, it also has a lot of the service manuals.

I don't feel the service manual side is as complete as mitchell protoman.

It has a lot of holes in it.

Um, mostly on stuff, that's, not super popular.

So you get in a, you know, a saab or a suzuki, you know, it's going to has big gaps there, evidently, you can call them and they'll.

You know, hook you up with what's missing.

But you know, it is a full full service manual for everything.

You know, everything changing your brakes.

You know, you want to put a transmission in it.


You can look it up.

How long does it take go to your estimator so there's, a lot of mumbo jumbo.

But hopefully it gives you guys some guidance and direction if you're googling around and looking for service info for free, you know, you might find it.

You might not you don't mind spending a couple bucks.

If you know you have the ability to fix your car.

I think these are viable options.

If it was me, I'd certainly would be looking into all data diy or the mitchell diy personally, um, just because you know, if it's like I'm only working on my own vehicle.

And I want my information on that.

Boom, you got it.

You got it for the year.

You know, for whatever it costs or five years, um short term, let's say, your buddy came over, you know, he's got a 12 pack and an engine light on.

And he drives a chevy, but you're a dodge guy.

And you don't know, nothing about it make him pay for it.

You know, go go to the gm.

Be like, dude.

We need we need information because the fact of the matter is, yes, you can fix cars without service, info you're going to fix it 50 times faster with it.

If you know where you're going, you know what you're looking for, you know what circuit it's on, you know, you need the specs to do, you know, the training rebuild, or you know, you're, you're putting heads on it you're like man.

I wish I had torque specs on it, were you going to trust google or you're just going to make them pay the 20 bucks and get it all and just go on and print out what you need? Or you know, instead of printing it out in paper, save it as a pdf.

I mean, that's that's easy to do.

You know, if you most of you guys are way more computer savvy than me, um, you know, it's, just here, the uplander let's pick that.

And this is only on on windows.

I think I'm, not an apple guy.

Let's go on here.


Let her load up I'll show you how to save stuff as a pdf.

Where am I stupid computers? I think you'll love it when videos fail, live, um.

So we're gonna go on here.

We're gonna wiring diagram for our cruise control.

We want that bad.

Boy, we're going to print it.

And I don't want to print it out I'm going to come here.

Instead of printing, it out we're just going to.

Why is this already set up as well? Because this hasn't, even hooked my printer, we're going to save it as a pdf boom here it is and we'll just put it on our desktop.

And there it is, you know, if you think that, you know, I got this short term subscription, go on there and save yourself a bunch of pdfs, save save anything.

You think you might need.

And then you know, boom, here it is on your desktop.

I don't, even think I've ever opened a pdf for this.

You know, but here it is for a later time, you know, you can interact with it.

You can print it.

You can do whatever you want at that point.

Um, yeah.

I've never even opened stuff here, um, but anywho that's that folks I hope that this is somewhat informative, lots of stuff available it's available to you and me.

I don't know about across the pond or worldwide, or how that works.

But in the continental usa, this is what's available to you if you're willing to spend a few bucks if you're not I'm sorry.

But I think the price is pretty reasonable for the amount of information get out of it and I'm going to call it quits it's too much talking, hopefully you enjoyed this video.

If you did go down there and give it that thumbs up, if not give it a thumbs down go in that comment box tell us why it sucked and just remember viewers, I can do it.

You can do it.

Thanks for watching.


How to get Ford wiring diagrams? ›

You can purchase online wiring diagrams from the Motorcraft®* Service website or through the Helm website.

What are the 3 types of wiring diagrams? ›

6.2: Types of Electrical Diagrams
  • Schematic Diagrams.
  • Wiring diagrams.
  • Block diagrams.
  • Pictorial diagrams.
Sep 11, 2021

What are the tips for reading wiring diagrams? ›

Tips and tricks for reading wiring diagrams
  1. When looking at a wiring diagram, don't try to focus on the whole page all at once. ...
  2. Print the wiring diagram off and use highlighters to trace the circuit. ...
  3. To properly read a wiring diagram, one has to know how the components in the system operate.
Jul 5, 2019

How would you find technical information and wiring diagrams in a service repair manual? ›

Wiring diagrams can be found in factory service manuals or separate wiring diagrams manuals. Factory publications vary, sometimes there is a separate manual for electrical wiring diagrams, sometimes they are included in the full service manual.

Can you get a build sheet from Ford? ›

Visit the Marti Auto Works website to determine which build sheet is right for you. Build sheets, or Marti Reports, provide the complete factory options list and door data plate info for Ford Motor Company vehicles.

What are the 3 basic rules of wiring? ›

General Rules For Wiring
  • Every installation is to be properly protected near the point of entry of supply cables by a two-pole linked main switch and a fuse unit. ...
  • The conductor used is to be of such a size that it may carry load current safely.
  • The conductors installed are to be safe in all respects.

What is a basic wiring diagram? ›

A wiring diagram is a simple visual representation of the physical connections and physical layout of an electrical system or circuit. It shows how the electrical wires are interconnected and can also show where fixtures and components may be connected to the system.

What does C mean on a wiring diagram? ›

But sometimes, you may need to connect a common wire (C wire) or power accessory, like the Nest Power Connector, to make your system compatible. Unlike other wires connected to your thermostat, a C wire doesn't control heating or cooling functions. It only provides constant power to your thermostat.

What are the five basic symbols used in wiring diagram? ›

There are five commonly used symbols in Electrical – Switch, Wire, Contactor, Motor, Transformer. These symbols can be used in any electrical drawings.

What is wiring diagram in automotive? ›

Automotive wiring diagrams are valuable resources for locating, diagnosing, and fixing any automotive electrical problem. At first sight, wiring diagrams can appear intimidating and complex – especially book-bound wiring diagrams.

What information are available from a wiring diagram? ›

A wiring diagram usually gives information about the relative position and arrangement of devices and terminals on the devices, to help in building or servicing the device.

Which electrical diagram is best for troubleshooting? ›

A ladder diagram is simple, easier to understand and helps in troubleshooting the circuit quickly.

Can you look up build sheet by VIN? ›

Step 1: Go to and enter the full VIN into NHTSA's VIN decoder, then click Decode VIN. Step 2: Refer to the field at the bottom of the page result, which expressly lists the build plant and country for the searched vehicle.

How do I get the original build sheet for my car? ›

By entering the VIN, a dealer can get a build sheet, which is a printout of how the car is equipped. That includes engine size, transmission, bed size, interior specifications and even factory options.

Are Ford truck bodies still aluminum? ›

Since 2015, Ford has made their popular F-150 truck out of aluminum. Then, in 2017, they also started creating their F-Series Super-Duty trucks out of aluminum as well. This trend continues until today, with these two models using aluminum bodies and all other Ford trucks having the typical steel bodies.

What wiring can I do myself? ›

Swapping out old or damaged wires, or moving sockets, ceiling lights, and light switches are all allowed, as well as installing additional switches, sockets, or lights in a room.

What are the common directions to draw wiring diagram is from? ›

The common direction to draw a wiring diagram is from UP to DOWN and from LEFT to RIGHT.

What is the wiring 6 12 rule? ›

NEC 210-52 states the following (abbreviated for easier digestion): Receptacles are needed in every room of a home such that no point on a wall is over 6′ from an outlet. This means that you need an outlet within 6′ of a doorway or fireplace. A long wall, however, may have up to 12′ between outlets.

What are the black wires always connected to? ›

Black wires are always hot wires that carry electricity. You should always treat these with extreme care. They feed a switch or outlet and are also sometimes used as switch legs or the connection that runs to the electrical outlet from the switch.

What is the most common wiring method? ›

The raceway and conductor method is one of the most common types of electrical wiring. It involves either a metallic or a nonmetallic conduit or tubing with multiple insulated phase.

What are 3 things a circuit must have? ›

An electric circuit has three parts: An energy source – like a battery or mains power. An energy receiver – like a lightbulb. An energy pathway – like a wire.

Can a circuit work without voltage? ›

Voltage is sometimes described as the 'push' or 'force' of the electricity, it isn't really a force but this may help you to imagine what is happening. It is possible to have voltage without current, but current cannot flow without voltage.

Is a black wire live or neutral? ›

Black (neutral) Red (live) Green and yellow (earth)

What are the two basic types of wiring systems? ›

  • Cleat Wiring- Cleat wirings are not the domestic wiring types, and more like for temporary systems like for in a building under construction.
  • Casing Wiring- This wiring was made of VIR cables with wooden casings.

What is the difference between a circuit and a wiring diagram? ›

It shows the components of the circuit as simplified shapes, and how to make the connections between the devices. A wiring diagram usually gives more information about the relative position and arrangement of devices and terminals on the devices.

What does LS mean in electrical wiring? ›

Ls means live supply so this is where you put 230v or 24v into the switching circuit on the device.

What color is L in a wiring diagram? ›

US AC power circuit wiring color codes
FunctionlabelColor, common
Protective groundPGbare, green, or green-yellow
Line, single phaseLblack or red (2nd hot)
Line, 3-phaseL1black
2 more rows

What color is the common wire? ›

If you live in the U.S., as per electrical codes, a common wire should be either white or gray. White common wires are seen more often. On the other hand, blue is a commonly used color code for common wires in European counterparts.

What is the symbol for battery in a circuit? ›

The two parallel lines, the shorter one marked with a – and the longer one with a plus, represent the standard symbol for a battery in a circuit diagram. The + is the positive terminal, and the – is the negative terminal.

What is the zigzag line on a wiring diagram? ›

An electrical device that offers resistance to the flow of charge is generically referred to as a resistor and is represented by a zigzag line.

What is the symbol for connecting wire? ›

The connecting wires in a circuit are represented by straight lines with dots to show where they are joined. If one connecting wire passes over another, without electrical contact, the symbol looks like a small bridge.

What is a schematic code? ›

A schematic is a template-based code generator that supports complex logic. It is a set of instructions for transforming a software project by generating or modifying code. Schematics are packaged into collections and installed with npm.

What rules should you follow when reading schematic diagrams? ›

The electrical schematics are read from left to right or from top to bottom. This is important to get right, as the signal direction indicates the flow of current in the circuit. It is then easy for a user to understand when there is a change in the course of the circuit.

What does a resistor do? ›

A resistor is an electrical component that limits or regulates the flow of electrical current in an electronic circuit. Resistors can also be used to provide a specific voltage for an active device such as a transistor.

What are the two wiring used in automotive industry? ›

Automotive wire is available in two main materials: copper or aluminum. Copper is more conductive, flexible, and less likely to corrode than aluminum; however copper weighs more and is prone to price fluctuations, so you'll need a good distributor to keep your costs low.

What does black wire mean in automotive? ›

In the wiring diagram, the black color is the connection between the main battery of the car and the inverter.

What is automotive wire called? ›

SXL is your standard cross-linked auto electrical cable that is mostly used in industrial general circuit wiring. Since it is the golden standard of industrial auto wiring, it is also often called "primary automotive wire." SXL cables possess excellent abrasion resistance.

What are the three 3 types of schematic diagram? ›

They are wiring, schematic, and pictorial diagrams.

What are the 3 types of wiring? ›

The three types of wires used in household circuits are Earth wire, Live wire, and Neutral wire.

What does L1 and L2 mean in wiring? ›

L1 and L2 are the wires which go to and from the power source. L1 is the hot wire. It carries 120V to the components. L2 is the neutral wire. It carries 120V back to the source.

What are the 4 types of electrical diagrams? ›

6.2: Types of Electrical Diagrams
  • Schematic Diagrams.
  • Wiring diagrams.
  • Block diagrams.
  • Pictorial diagrams.
Sep 11, 2021

How do you diagnose an electrical problem in a car? ›

The 5 Most Common Signs That Your Car's Electrical System Is...
  1. The Engine Won't Crank Properly.
  2. You're Experiencing Battery Problems.
  3. Headlights And Other Lights Are Not Working Properly.
  4. Your Fuses Keep Blowing Out.
  5. You Smell Burning Plastic Or Electrical Insulation.
Feb 8, 2018

How do you trace concealed wiring? ›

A current- carrying wire concealed in a wall can be located due to the magnetic effect current by using a plotting compass. If a plotting compass is moved on a wall, its needle will show deflection at the place where current-carrying wire is concealed.

Does AllData have wiring diagrams? ›

AllData provides access to dealer OEM wiring diagrams.

How do you trace a wire without a tracer? ›

To use a tone generator, clamp the transmitter to the wire in question. The device will send a signal through the wire, and when using the receiver on the other end, it will make a chirping sound when the matching wire is found. This eliminates the need to trace a wire through the wall.

How do you tell which wire is hot when both are black? ›

Use a test lamp. It's just a light bulb with two wires coming out of the holder. Touch one lamp wire to one of the black wires and the other lamp wire to the ground wire. If the bulb lights up, the wire is hot.

How do you trace a wire that has no power? ›

To find wires without any power one of the handiest tools is an electronic stud finder. Most stud finders are equipped to handle finding wooden studs in the wall, but some can also be used to find wires as well. To find out if a wire is live, you'll also need a voltage detector.

How do you decode a Ford? ›

For Ford, this is what it will look like:
  1. 4th character: Restraint System Type, This includes the total safe weight of your vehicle. ...
  2. 5th-7th characters: Model, series, and body code. ...
  3. 8th character: Engine Type. ...
  4. 9th character: VIN Check digit. ...
  5. 10th character: Vehicle, Model year. ...
  6. 11th character: Assembly Plant.
Dec 14, 2022

How do you decode a Ford engine block? ›

A = 1940s, B = 1950s, C = 1960s, D = 1970s, E = 1980s, F = 1990s. The second digit will be a numeral, and will represent the year within that decade (i.e. C2 = 1962; E7 = 1987). The third digit is usually another letter, but can also be a numeral in rare cases, and it signifies the vehicle the part was designed for.

What are Ford OEM parts called? ›

In fact, Motorcraft is the official parts brand of Ford and has been since its inception in the 1950s. Ford used Autolite as its parts manufacturer for a brief period in the 1960s. Ford owns Motorcraft.

Is there a free version of ALLDATA? ›

To download and install the ALLDATA app:

Search for ALLDATA. Select the ALLDATA app. Tap Free.

What are the two types of wiring diagrams? ›

There are two common types of wiring diagrams. They are: Schematic diagrams, and. Ladder diagrams.

Is Mitchell or ALLDATA better? ›

Alldata rates 4.3/5 stars with 22 reviews. By contrast, Mitchell 1 Automotive Repair rates 4.1/5 stars with 18 reviews. Each product's score is calculated with real-time data from verified user reviews, to help you make the best choice between these two options, and decide which one is best for your business needs.

How do you diagnose car wiring problems? ›

Common Symptoms of Automotive Electrical Issues
  1. Engine Doesn't Start Correctly. The car's engine requires electrical power to start. ...
  2. Battery Problems. A discharged or dead battery is an obvious electrical problem. ...
  3. Headlights and Other Lights Malfunctioning. ...
  4. Blown Fuses. ...
  5. Burning Plastic Smell. ...
  6. Safety First.
Oct 3, 2019

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