Help identifying some connectors

c6matt

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Joined
Dec 31, 2022
Using a factory harness for a hybrid swap. I have about 95% figured out and labeled, but a few stumping me. Any help is appreciated. Chiltons with the wiring diagram is enroute. White connecter is inside the firewall. Other connectors are about 1 foot to the passenger side from the engine centerline, thanks everyone!
 

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Assuming a 1986-1987 harness the white connector looks to be the 15 cavity C437 connector that plugs in behind the glove box into a black connector there. Here is a link to the factory manual section 8 is electrical. Page 201-17-diagram C shows where that plugs into. Feeds a lot of stuff so you'll have to go to each section to see if they reference that connector then trace the wire colors. ECM section for Turbo V6 code 7 shows that connector in it and what some of the wires do.
 
Thank you very much. I only have the engine harness and have been manually pinning it out, this is a big help.
 
What I really think I have is a Turbo Trans am Harness. That is based on the wiper motor plugs being the more modern weather pack and not the flat terminals of the Buick. Not sure of all the harness differences, but the Buick manuals have worked so far.

The large red wire in the 2nd photo feeds right to the fuseable link ring terminal on the starter.

The engine is a 87 Grand national/2004r set up ( forged bottom end, stock crank), small cam, P&P heads and T44 Turbo (I think, need to do some more digging on the turbo, but its not stock.)
 
You can see the area of the harness I am trying to figure out here, that 2 prong connector, I think the green one is a tach lead.
 

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I would strongly suggest you reconsider using that 35 year old harness. I’ve seen so many issues with open circuits or worst of all intermittent contacts with used harnesses. Heck, on my GN I’ve replaced the ccci, tps, relays and the ECU bulkhead connectors due to corrosion or contact fatigue. The amount of time it takes to chase them down and solder in new ones is ridiculous. Caspers electronics did build replacements harnesses for GNs and I believe they did custom ones too.
 
I would strongly suggest you reconsider using that 35 year old harness. I’ve seen so many issues with open circuits or worst of all intermittent contacts with used harnesses. Heck, on my GN I’ve replaced the ccci, tps, relays and the ECU bulkhead connectors due to corrosion or contact fatigue. The amount of time it takes to chase them down and solder in new ones is ridiculous. Caspers electronics did build replacements harnesses for GNs and I believe they did custom ones too.
I appreciate that. The harness I have was used in a previous hybrid swap and has seen limited use, additionally I am running a MS3 pro ecu, so the circuit diagnostics will be better than most. Just making sense of the connections, appreciate all the help!
 
I appreciate that. The harness I have was used in a previous hybrid swap and has seen limited use, additionally I am running a MS3 pro ecu, so the circuit diagnostics will be better than most. Just making sense of the connections, appreciate all the help!
I didn’t see how far you were with the install. It’s not the amount of use but rather the age of these harnesses that’s causing the issues. I’m an old engineer that used to design electrical connectors for all kinds of applications including automotive. These Buicks use connectors that were never meant to function more than 15 years let alone 30 plus. Chasing electrical gremlins is never fun.
 
That looks like the pigtail for the TTA tach
Thanks, appreciate the thoughts. I have confirmed the white wires are the tach. Now working to figure out this. It is fed off the fuel pump relay.
 

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