84 dash harness vs 86-7

[INEEDAGN]

Are they the same? Both turbo of course.

I didn't see it listed in the hotair to IC conversion list so I assume they are. I just bought a really sweet 84 T that some huge, HUGE bag of douche somewhere gutted the powertrain out of, and I'm going to put an 86 powertrain in it. Don't shoot me for it, the 84 engine is long gone and the LC2 is already here.

Maybe I should put a crate 350 in it instead. "Elderbrock" carb, 3/4 race cam, some headers, and a stall converter...she'll be a sweetie...

 

[INEEDAGN]

Why was this moved to general tech? No one over here knows a damn thing about hotairs...that's why I thought i'd ask the HOTAIR crowd....

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[Squid4life]

Bob, when I converted my hot air to IC I did not change anything inside with regards to harnesses. I used the 87 engine harness and went to town.

I am truly jealous, that car looked crazy clean! I loved it, wife hated the color. I should have bought it to spite her!

Good luck brother!

 

[Nick Micale]

Why was this moved to general tech? No one over here knows a damn thing about hotairs...that's why I thought i'd ask the HOTAIR crowd....

That is not true, I have worked on hot air cars for years, and had 6 of them through here this summer!

To answer your question, the harness is very different between HA and IC, so save yourself lots of grief and use the '86-7 harness.

 

[INEEDAGN]

I'm using the main engine harness from the 86, the one that goes under the hvac box to the ecm and comes out and does the whole engine bay. The one I'm curious about is the one that plugs in the bulkhead on the drivers side and runs the instrument cluster and radio. I hear conflicitng data on it and trying to get it straight. Swapping a dash harness sounds like work.

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[turbonut85]

Ask Austin.....his car is a converted 84.....

 

[Nick Micale]

You do not need to swap the dash harness.

 

[INEEDAGN]

Ask Austin.....his car is a converted 84.....

He was having some electrical problems awhile back and was asking if he needed an 86-7 dash harness. That's why I posted this thread.

Thanks for the input Nick.

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[INEEDAGN]

Just an update. I ended up doing some research here because of some wire differences. There's a gray wire that runs from the egr sol. over through the ecm hole and out to the aldl port for manual egr operation and there's a couple wires different on the drivers side but they were labeled as cornering lights and powermaster brake wire which hydroboost cars won't have or need. So in short, the dash harnesses are slightly different but there's nothing anyone will ever use.

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[INEEDAGN]

Update! I was wrong. the 12v ignition feed for the fan relays gets its power from the dash harness and my fans don't work because there's no power there. This is the no load power just to energize the relays, not the main power for the fans which comes from the fuselinks at the starter. Thanks to the vortexbuicks site I learned that the 86 harness differs from the 87 in which of the dash fuses it gets power from which is probably why I didn't catch this. I have an 86 harness and an 87 manual on an 84 car, lol. Its still not worth the trouble to swap the harness over this wire but its good for others to know. I plan to give it 12v from the cruise harness or something similar nearby, any 12v key switched source will do.

This may or may not be an issue depending on what year harness vs car you have.

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[INEEDAGN]

Looks like the evap purge solenoid is the best/nearest source. 12v with key on and ecm grounds the sol to purge. The stock fan relays pull .145 amps to stay energized in case anyone else runs into this

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