Wiring diagram error??

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Jhenry70

Jhenry70

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So, I been working on my engine harness, the car is a 72 Duster but the harness is out of a 71 340 Duster, I didn't have any harnesses except the under dash when I got the car. I'm going through the harness and pulling out some really bad splices and brittle wires (bulkhead connector is good) I'm also working on the ammeter bypass as well as wiring in a five position ECM and four post ballast resistor...

Doing pretty good with chasing and splicing in new wires and connectors, but spent a bit of time scratching my head on the factory chassis manual wiring diagrams. In the first picture you can see where I circled the areas in question. The bulkhead connector position "L" shows a DArk Green/Red wire going to the horns... The position "T" on the other connector has a yellow wire going to the starter solenoid. My actual connector has a yellow wire at the "L" position and looks to go to the solenoid. (I didn't have the other connector with me at the shop to see what color was coming from the "T" position.

Now the interesting part... the factory Chassis Manual (same manual) for the dash wiring on the inside bulkhead connector position "L" is labeled with a yellow wire and traces to the start position on the steering column (pic 3) and a dark green/red wire traced to the horn relay (pic 2).

Am I seeing this wrong or are the diagrams totally wrong?
 

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The screw up through the bulkhead connector on the horn wire and the start (yellow) wire is fairly well known. Yes. mistake in the manual. I don't remember off hand what years this affects, seems to me about 69-72, not sure.

If you are being careful, I guess I don't have to alert you to be careful of different years' harness.
 
Well it wasn't well known to me... And since I'm being very careful and going through it wire by wire and referencing the manuals every step along the way it made me have to check and double check to make sure I hadn't screwed something up.
 
Are there any other "Gotchas" in the diagrams that are known? Anything to save me frustration later on would be appreciated.
 
Jhenry70 said:
Are there any other "Gotchas" in the diagrams that are known? Anything to save me frustration later on would be appreciated.
Click to expand...

I don't remember but I always use a pretty "jaundiced" eye LOL

One thing we all run into is that over the years there are omissions of some options (some of which seemed to have been dealer installed, and likely had separate destructions" and this varies over the years. Another is "scattered" info that is in some years there is separate electrical info in the "body" section, and the heaters / AC section is a better place to find the AC wiring.

Same is true of wipers which are a bit of a hassle. There's good info on wipers over at Passion

http://www.passion4mopars.com/

And section 8 of the shop manuals has troubleshooting and diagrams in the wiper section of chapter 8

Are you aware, of all the great downloads at MyMopar? Not only shop manuals, but other bulletins?

http://www.mymopar.com/index.php?pid=31

"Big Block Dart" has some great tech pages

http://www.bigblockdart.com/techpages/techindex.shtml

and not electrical, either, but some good info here

It says "70" but there's lots of other stuff there, look around

http://www.hamtramck-historical.com/
 
67Dart273 said:
Are you aware, of all the great downloads at MyMopar? Not only shop manuals, but other bulletins?

http://www.mymopar.com/index.php?pid=31

"Big Block Dart" has some great tech pages

http://www.bigblockdart.com/techpages/techindex.shtml

and not electrical, either, but some good info here

It says "70" but there's lots of other stuff there, look around

http://www.hamtramck-historical.com/
Click to expand...

Thanks, mymopar is where I got the chassis manuals and I've checked out some of bigblockdarts stuff. I'll be going through a lot of these resources once I start splicing in the ECM and four post ballast resistor. The harness I have has the two post resistor and was for a points car. My engine is a 318 with the distributor that came out of an electronic ignition car. I've got the five post ECM with the pigtail for it and the four post resistor and electronic voltage regulator mounted, just got to splice it in now. Taking it slow and doing a lot of reading.

I'm sure I will be posting questions as I make progress.
 
If I were you I'd determine if the ECU you have is "really" 5 pin. Physical pins don't matter. Many of the "4 pin" ECUs have 5 physical pins. You have to check resistance carefully from the 5th pin to everything else to determine if that is what it is.

To my knowledge, NO one in current production makes 5 pin boxes anymore. If the one you have is 4, you can stay with the simpler 2 pin resistor.

Also, if you have a good points distributor, you can easily use it in emergencies. Say the ECU quits. Just unplug the ECU, stick in the points distributor, and hook up the dist. wire to coil NEG. That's all.

In fact, years ago, I actually used "some bracket" and bolted a coil to a spare Mopar distributor, making a "spare" ignition system before anyone invented "ready to run" LOL

Yet another way when I test fired a junk engine, is an HEI box.........(I run an HEI module with my car anyhow)

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I'll have to check my box, the harness for it that included coil wires, distributor connector, ECU connector and four post ballast resistor connections. It was sourced from a 79 Dodge pickup. I had the counter guys at Napa provide me with the ballast resistor and ECU (5 pin gold box) for that vehicle. The harness was intact and utilized all five pins...
 
Yeh, that's the thing. Many (all?) later replacement ECUs may or may not actually have 5 pins, but many are a "dummy" "Only your ohmmeter knows for sure," LOL
 
Ya , I ran into something similar when restoring my rallye cluster. Try finding a rallye connector pin out in the 70 manual. I found one in the 71 manual though.
 
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