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sodly

10-14-2025 12:54 PM

Engine wiring harness question

1 Attachment(s)

Can anyone tell me how to remove the wires from this engine harness plug (1966)? This is the plug that plugs into the firewall. How do you remove a wire from it? Do you need to stick something into the plug to release a tang? I have one wire that's developed a bare end that needs to be cleaned up. Probably will have to remove all of them from the plug to fix the one.

Anyone know what style of spade is on these wires that goes into that plug?

By the way, the problem wire is different than the others. It has sort of a metal braided coating, unlike the others that are colored plastic. Anyone know off hand what this wire does? The wiring diagram is unclear. This is a completely stock 327 truck.

Thanks!

MusicMan70

10-14-2025 03:09 PM

Re: Engine wiring harness question

I read this over on the Electric section of the forum, but I'd ask there to be sure. Subject is a 69 truck so not directly applicable.

I'm sure VetteVet will know.

https://www.67-72chevytrucks.com/vbo...l+braided+WIRE

Quote:

Next is the cloth covered wire that started life as an orange/purple white wire that is a resistance wire to protect the ignition coil from overheating during normal running. It drops the ignition voltage to approximately 8 volts to the positive side of the coil. It joins a yellow wire which goes to the I terminal on the starter solenoid. This I terminal sends a full 12 volts to the coil during starting for a hotter spark while the engine is cranking.

sodly

10-14-2025 04:35 PM

Re: Engine wiring harness question

Thanks, MusicMan70. Duh! Didn't even think to ask there.

ray_mcavoy

10-14-2025 06:11 PM

Re: Engine wiring harness question

That connector uses Packard/Delphi (now Aptiv) 56-series terminals.

Here is a video showing how to remove them --> https://www.youtube.com/watch?v=beAQpdTXIgw

You'll be dealing with the male terminals on the engine side of the harness.

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