TPI complete transplant, 83 k10

[Captkaos]

There is a front lighting harness, rear lighting harness and engine harness on the truck.  If it was carb'd, you will end up using most of the engine harness for the motor, nothing changes with the front/rear lighting.  You need to modify the Vette harness and just send it power and grounds to make it work..

[Brocksdad1]

Yea I guess I wasn't clear. And I was having a brain fart.
I need to just use truck power and ground to the Vet harness,
Vet harness will supply power back to the battery for charging.
I think I'll use truck wiring for starter? And AC.

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[LTZ C20]

Get a wiring diagram for the engine wiring for the truck and for the vette, then match up the wires (alternator,  oil pressure, coolant temp exc.) Then just splice the truck and vette harnesses together,  effectively making it one complete harness as if it's supposed to be like that. Then you will also find out where to get your power and grounds.

The idea is to supply the power/ground for the vette harness as needed and mesh the 2 harnesses together so they finish as one.

[Brocksdad1]

Get a wiring diagram for the engine wiring for the truck and for the vette, then match up the wires (alternator,  oil pressure, coolant temp exc.) Then just splice the truck and vette harnesses together,  effectively making it one complete harness as if it's supposed to be like that. Then you will also find out where to get your power and grounds.

The idea is to supply the power/ground for the vette harness as needed and mesh the 2 harnesses together so they finish as one.

Gotcha

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[Brocksdad1]

So I just went and got some hydraulic fittings from a company here locally called Siscos hose and hydraulic. They told me that they can make my fuel line's. And they even have the snap connectors for the sending unit! And the correct screw on style ends for the Vet fuel lines. How great is that!
I'll be getting my sending unit today and lines this Saturday. I'll be sure to take pics and get part numbers.

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[LTZ C20]

Good to hear! That's how you research and find a way to get it done.

[Captkaos]

you can stand alone the harness for the truck.  The TPI online needs a ground, power and a few sensors.  The truck harness doesn't have to be spliced short of the power and grounds.

Look here too: http://www.chevythunder.com/

[Brocksdad1]

you can stand alone the harness for the truck.  The TPI online needs a ground, power and a few sensors.  The truck harness doesn't have to be spliced short of the power and grounds.

Look here too: http://www.chevythunder.com/

Chevy Thunder is great.

I printed the entire TPI section of the site last night and took it to work and hole punched it today for a binder.
Tonight is the start of the wiring.

Wiring is my thing as a heavy equipment tech, so I should be good.
I've got my solder and heat shrink tube.

One question Capt
Where did you go through the firewall for the computer harness?

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[Captkaos]

On the 81-up 1/2T truck there is a ESC with a grommet at the firewall.  I unpinned everything and passed the wiring through that.
You can see in this picture where it comes out.



The TBI trucks used the same grommet and mounting are for the ECM instead of the ESC box.  The Vette box should fit right in a TBI holder under the dash just like mine did.


All you need are grounds, switched power, ING, fuel pump if you leave the emissions stuff off.  Check some of Street and Performances pages also:
http://www.hotrodlane.cc/

[Brocksdad1]

Thanks a bunch.

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[LTZ C20]

That's what I did too. I took apart the ECM plug, each wire was labeled and mapped on a grid for proper reassembly, then passed the harness thru the firewall, then put it all back together again.

[Brocksdad1]

Well this is great. The wiring talked about on Chevy Thunder doesn't pertain to my 89 vet.

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[LTZ C20]

Did you get wiring diagrams for both vehicles like I said?

[Brocksdad1]

I do.
There are some discrepancies on the injectors Conn. And what wires need to be connected to power.
In Chevy Thunder it's a different harness.
Hotrodlane doesn't help. Good info but no help on this harness.
They all talk about 88 and below.
I can do alot. But I don't want to fry this comp.

I got all the wires separated today, and the OBD port aswell.

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[Brocksdad1]

Here's the deal
Chevy Thunder show the injectors Conn having 3 wires mine has more and different colors,
Here are some pics.

Has anyone else used a 89 harness?


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The white connection is what I'm assuming is the injectors Conn. Not sure.

Also nothing I'm finding is telling me wether to use the Vet harness for the distributor and starter. Or the truck harness. Everything is very vague.

Please help.