Truck wiring harness

Hi all,

I'm gathering parts for a winter swap of an LS1 into an 84 944. Engine is soon off the be balanced and then assembled. I don't have a wiring harness or ECU. Will one work of an 06 1500 1/2 ton truck (with an ECU flash of course!) with a Vortec 4800 engine? Any disadvantages of a truck harness?

Thanks,
Gord.

The main disadvantage of the truck harness is that it's "backward" from how you likely want it. That is, the truck has the ECM at the front left (driver) fender, you most likely want to mount it in the OEM location of passenger footwell. So the wires for one side will be too long and the other too short. There are companies that will mod your harness for $500 or so or you can do it yourself. I chose to do my own; it's almost done now. It was confusing at first, but makes sense after a while. You can see some pics of the process on my build thread here:

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I should update with some newer photos, after sorting it all out on the workbench I laid it out on the engine then measured and cut/spliced the wires to the correct lengths.

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majormojo wrote:...the truck has the ECM at the front left (driver) fender, you most likely want to mount it in the OEM location of passenger footwell.

I have a 'truck harness' and plan to mount "the ECM at the front left (driver) fender". But whatever floats your boat.