Help needed for wiring harness on LS3 swap

[Trevor @ Tx Speed]

I agree that it will work. But, the number one complaint we get from customers with the GMPP harness is the extra length that requires trimming to make it look good. Most of our customers don't want to trim their new harness and/or don't trust themselves to do it. We had a customer order a custom harness last week that returned his GMPP harness. To each his own.

Originally Posted by Vega$69

The OP has a 5 speed Tremec. No reason to spend a dime on a custom harness.

The long GMPP sensor wires can easily be shortened by pulling of the split wrap folding the wires to desired length and wrapping with nylon braid. You can do them all in an hour most.

Then it's just a matter of strategically placing the ECM and fuse box and tucking the excess cable into the pass side inner fender.

Can all be done in a day including beer breaks.

[Vega$69]

You don't need to shorten, cut or re pin to do the job.

This is my new build in progress. The fuse box is mounted behind the pass headlight and all wire bundles are securely tucked in the inner fender along with the AC and heater hoses.

The sensor wires will be folded into power braid to the proper length

[droptop 63]

Originally Posted by Vega$69

You don't need to shorten, cut or re pin to do the job.

This is my new build in progress. The fuse box is mounted behind the pass headlight and all wire bundles are securely tucked in the inner fender along with the AC and heater hoses.

The sensor wires will be folded into power braid to the proper length

Beautiful detail. My problem is space under the dash on a 63 nova once you try to make the Vintage Air box fit in the same space on the firewall. Any suggestions??

[randy]

Originally Posted by Vega$69

You don't need to shorten, cut or re pin to do the job.

This is my new build in progress. The fuse box is mounted behind the pass headlight and all wire bundles are securely tucked in the inner fender along with the AC and heater hoses.

The sensor wires will be folded into power braid to the proper length

my harness is complete and i second this. Hardest part is finding room to mount the fuse box and ecm

[ADiCarlo]

I vote for PSI I know and have seen a ton of people running their stuff.


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[alongfortheride]

I have not ran psi. I have now ran 2 Speartech units. 1 ls1 t56 and 1 lsa856. I must say the Speartech stuff is very nice. He will make it what ever length you would like. John is great.

[cpd004]

I've had both PSi and Speartech...the Speartech is the nicer looking of the 2 and seems to be better built. I could be wrong, though. It's cost is much higher. The braiding they use is the softer material making to easier to tuck in and around things compared to the corrugated stuff. There wires seem to be more pliable. Also, Speartech provides provisions for AC and cruise control. Their fuse panel is less bulky and no need to run wires down to the starter like with PSi.

Both companies are always quick to provide tech support.

I have no experience with a GM harness, but if I already had one....I'd definitely use it and spend money somewhere else. Something always comes up that you didn't expect.


BTW Vegas...that engine bay looks great!