Off-Road Forums & Discussion Groups - View Single Post - 5.7 Vortec Wiring harness - Painless or use factory
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post #4 of (permalink) Old 04-20-2009, 08:46 PM
I Might Just Know What I'm Talking About
JeepDawg's Avatar
Join Date: Dec 2006
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I did a SBC swap using an engine out of 93 Chevy P/U....the wiring part was easy....once I figured out what was missing....when they cut it out they chopped the wires at the fuse block and left off the VSS.

The only real issue is if your setup came with or without an auto tranny...if it originally came with a tranny, then unless you are putting that in as well, then you need to go Painless.

If it did not have a tranny or you are using the tranny that came with it (most likely a 4L60E) then I would use the stock harness.

The stock harness goes to everything on the engine and then connects to the computer....there are only about 6 connections (and will be the same for the Painless setup)

Battery feed (fuseable link)
Fuse feed Injectors
Fuse feed for Tranny
Fuse feed for fuel pump
Ignition On
Ignition Crank
Brakes (auto tranny...disconnects the lock up converter)

There are some misc wires related to cruise control and ABS brakes.

AKA DDawg16
84 CJ7, SOA, 5.7LTBI, 4L60E, 35"x12.5, 4.10 gears, F/Det, R/ARB, Full Roll Cage,
D44 Flat top in progress...
Link to my Frame up Restore
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