72 Chevelle Engine Wiring Diagram
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Well, after four weekends of research, reviewing wiring diagrams, and wiring harness cleaning and rewrapping, I've been able to identify all of the connections on all of my harnesses. I bought my Chevelle as a project with all of the harness removed and stuffed into a big box. It's been a real puzzle determining what plugs into what, even with a Factory Assembly Manual and factory wiring diagrams. They are ambiguous to say the least. Most of my research was on this forum, and I want to thank everybody who responds to questions. And a special thanks to Elree Colby for all of his responses and insight on Chevelle electrical systems.
I am not new to this forum, but this is only my second posting. I want to pay forward the results of my work. I have photographed and documented each and every wiring harness connection in my car. This information is posted on the following web page:
http://www.cars.russgreen.net/1972_SS/Wiring/1972_chevelle_ss_wiring.html
Included are several diagrams that I scoured from this forum and the internet.
I hope this is helpful to all of you trying to identify that mystery wire that you just can't figure out what it goes to.
If I am wrong or have mis-labeled any of these connections please let me know. Also, if anyone has any additional information they would like to contribute, please send it to me. I plan to continue to add photos as I get the wiring installed in the car.
Good luck to all.
Dean
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WOW! :thumbsup: :thumbsup: :thumbsup:
Let's move this to the electrical forum
1971 Chevrolet Chevelle Malibu
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I may very well be wrong on this but on the tail light harness AP should be the tank connector & AQ should be the license plate light.
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Russ
nice work:thumbsup:
hmardown
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Discussion Starter · #5 ·
You are absolutly right Hank. Thank you for catching that. I had them labeled backwards. The brown wire is the license plate light and the tan wire is the fuel gas gauge wire. It is now corrected.
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Discussion Starter · #6 ·
Dumb question, but how do I move this post to the electrical forum?
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Dumb question, but how do I move this post to the electrical forum?
Ask Dean - he can work all sorts of magic
BTW - Great job....Thank You! :beers:
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WOW! :thumbsup: :thumbsup: :thumbsup:
Let's move this to the electrical forum
WOW is RIGHT!!!!!!!!!!!!!!
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Hi Russ,
Excellent work on your website. I only wish I could use more of it. I've run into a great deal of ambiguity in wiring diagrams for 1972 Chevelles. None of what I've found on the internet exactly matches what I have in the car. I feel like an idiot trying to figure this wiring out.
Did you find that there were differences and changes within 1972? I've found wiring diagrams from various sources, and none have matched the wiring colors or the connector pinout that I have. Many are close, but for instance, I have found no wiring diagrams that have the purple starter solenoid wire at the same position in the engine header connector as what I have.
I see your great pictures, but mine doesn't match. Arggggg! Any advice? Do you know if there was a change mid-year or something? I'm fairly certain that the wiring has never been changed in this car.
Thanks,
Steve
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Discussion Starter · #10 ·
Hi Steve,
What I found with my Chevelle is that my bulkhead connector did not match any documentation exactly either. It matched the diagrams pretty closely though. My belief is that the bulkhead connectors were built based on the options ordered with each car. My car was an AC car with gauges and tach and had more bulkhead connections than show up in the diagram. The bulkhead pinouts shown were correct for my car. I wouldn't think the locations would change, as replacement harnesses would have to plug in correctly. My engine harness was all chopped up at the starter and alternator connections, so I replaced it with one from American Autowire. It matched my original exactly at the bulkhead.
I would suggest checking all of your bulkhead connections with a test light if you haven't already. That's how I checked mine. With all of the sealer the factory put on the outside of the connector, it was the only way I could tell which wire went to which pin.
I am by no means an electrical expert for Chevelles. That is why I documented all of my connections after weeks of searching for answers myself. Best of luck to you.
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HI Russ.
May I offer a suggestion and ask that you put your pictures and details in this thread. That way, if you ever move web providers or cancel your web page, the pictures and details are here forever. Broken links are a real disappointment. Great job BTW.
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OMG!! thank you som much for the help and timie you have put in to this :hurray:
Have a w-code -72 ss 454 th400 12bolt cowl orginal ac car (not ac now)
and changing the dashboard right now so enormus help from your page
thanks agin
a chevelle buddy from sweden!!
Best Regards// Magnus
Have a question what is the thing standing in the body behind the back rest rear seat in sheet metal seen in picture 21(not painted) (headliner istalaition) on your page i have the same!!
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Discussion Starter · #13 ·
Thanks Magnus. I'm glad that this info is of some help. I've installed my dash now and am getting ready to install the engine compartment wiring. I plan to add pictures as I complete the wiring.
The object in the rear divider that you asked about is the gas tank vent canister. The three vent lines on the gas tank connect to the bottom of this, and the a fourth line routes from the bottom of this canister up the driver side frame (beside the brake line) to the charcoal/emissions canister mounted in the engine compartment behind the left headlight.
Best of luck on your Chevelle project!
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Hi Russ,
Thanks for the advice. That's exactly what I did. I went through wire by wire and figured out which wire goes where in the dash and the engine compartment. The wire colors seemed to be mostly (or all?) the same as in the diagrams, but the positions in the header connector were different. I've printed off 3 different wiring diagrams from various sources, and none of the 3 matched the other exactly. I guess it is trial and error. It was quite a project, but I ended up making a couple of sheets that showed the pinout of my bulk connector, one from each side, as the colors sometimes changed going through the firewall.
Here's what I came up with... hoping it will help someone else.
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Wow this is great! Thanks
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This is awesome, thanks Russ....
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I just wanted to say thanks so much for posting this. I am currently restoring about the exact same car (my first) with the only differences being that I'm using a 350 w/ MSD ignition. I've been looking everywhere in google for a good explanation of what the wires do and finally started reading posts when I didn't get much there. Would anyone know if I will need to hook up the TCS stuff since I'm using the MSD system?
Thanks!
Scott
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Discussion Starter · #18 ·
I just wanted to say thanks so much for posting this. I am currently restoring about the exact same car (my first) with the only differences being that I'm using a 350 w/ MSD ignition. I've been looking everywhere in google for a good explanation of what the wires do and finally started reading posts when I didn't get much there. Would anyone know if I will need to hook up the TCS stuff since I'm using the MSD system?
Thanks!
Scott
I don't plan on hooking up the TCS on my car. From what I've read, It isn't required. I should be done with it next month (I hope).
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I didn't see a connection for a convertible top switch. Is it not part of the dash harness? Or is there a different harness?
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Unless I'm mistaken, this is a special option wiring set-up. It's independent of the dash wiring. Due to the load of the system a dedicated 10 ga. feed passes thru the firewall to a circuit breaker that gets power directly from the horn relay.
Posted by: bobgrieste012881.blogspot.com
Source: https://www.chevelles.com/threads/72-chevelle-wiring-connection-pictures-and-diagrams.401618/
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