TPI complete transplant, 83 k10

[Brocksdad1]

Nice. Have you decided where you are gonna put the ECM? In factory mount?

Yea it's going right in the factory mount.

Now to figure out the AC and alternator and all that.

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[LTZ C20]

Can you post a pic of that area? I'm interested to see how that's set up.

What exactly do you have to figure out for the ac and alt?

[Brocksdad1]

Well the Vet harness is there and nice. But I need it actually on the truck harness side. So I'm going to keep the Vet harness prewired for everything, and splice my pre-existing truck harness into it where needed for alternator and the ac,
I'm inside at the moment I'll get a pic of the under dash tomorrow

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[Captkaos]

LTZ C20 I posted a pic of it in Reply #83

[LTZ C20]

Oh ok. Sounds good. Thanks Capt, I'll look again.

[Brocksdad1]

I got a bunch of the wiring done today. But I'm stumped on the AC part along with the fan.

I can't seem to find a good 89 vet accessories schematics that lines up with mine. And when I picked up the Vet the fan and a few other things where already unplugged.
Also I want to be able to use my ac. So I'm off to the web for hours of digging.

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[LTZ C20]

What exactly are you looking for for the ac setup? I think your looking for the ac request wires that tell the ECM to up the idle and the engage wires that activate the compressor right?

[Brocksdad1]

I just wanted to k ow what to hook up to so my compressor works when I need it to. It's also supposed to come on when the rad fan comes on.
The only plug I can find that will fit into the fan plug is purple on one and black on the other.
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[LTZ C20]

Yea basically. When you turn on the ac it sends power to the ac request wires for the ECM increasing the idle. It also sends power to the compressor, engaging it and power to the fans. I have a 91 camaro with the same engine, I believe that at op temp both fans come on low, when ac is requested, fans turn up to hi. My truck is set up so that at op temp 1 fan runs and at ac request the second kicks on. This is because the fans I have are single speed and I think the vette vans are dual speed. Did you find the wiring diagrams yet? If you can't find them by Monday or if you just want to wait till Monday I can see if I can find some diagrams at work.

[Brocksdad1]

I have a single fan.
I can't find the plug for the fan. I guess it's gone. Cut off buy the junkyard, they had started on the Vet. I don't have a clue witch one of the 4 is the fan relay. Every harness diagram I find is different from what I have.
I appreciate the help.
I'm still digging.

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[LTZ C20]

Ok. I'll see what I can dig up on monday. The best way when you find out what color wire and position it is, start at the ECM plug and work your way out following the wire till it stops, it may lead to a connector or cut end. At that point you can either try and buy new connectors or go to a junk yard again and find another vette and cut those connectors off and take them home and solder and heat shrink them into the harness or use butt connectors with heat shrink ends or something. You want them to be water proof. Every time a make a wiring repair or have something apart under the hood, I upgrade the connections to Packard style weatherproof plugs. That's the factory type GM used. Eventually all my under hood connections will be water proof, the older vehicles connections were ok but not the best for keeping water out.

[Captkaos]

The power request for the AC has to come from the truck though..

[Brocksdad1]

Yes sir. Not sure where to tie into it. Before computer, or at the compressor

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[Captkaos]

Straight to the compressor. It should have a tail on it to tie into the Vette harness...

[Brocksdad1]

10-4 I'll get that done then. Thanks.

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