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Old 10-08-2018, 02:45 PM   #1
scoobiedoo01
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LS swap with PSI wiring harness

I'm in the middle of installing the wiring harness from PSI into my 67 C10. Running a L92 with 6L80 trans. My main question is which wire do I tap into behind the ignition switch on the dash that would go with the Ignition Feed wire from the PSI wiring? It calls for 12v in start position and also in accessory but no power when off. Does anyone have a picture of the exact wire from the back side of the switch where the wires come out?

Thanks much!
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Old 10-08-2018, 03:13 PM   #2
Low Elco
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Re: LS swap with PSI wiring harness

I used the big purple. That's the excite to the starter. Pick it up after the Neutral Safety Switch on the column, if you have an Automatic.
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Old 10-08-2018, 03:32 PM   #3
scoobiedoo01
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Re: LS swap with PSI wiring harness

My truck was originally a 6 cylinder manual 3 speed on the tree. I do know I need to add a neutral safety switch but didn't come with one.
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Old 10-08-2018, 06:32 PM   #4
ls1nova71
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Re: LS swap with PSI wiring harness

I'm sure your harness came with an ignition relay, right? If it didnt you will need to add one, but if it did, then you will turn that relay on with the wire that originally went to the coil. The pink wire in the top of the pic.
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http://ls1tech.com/forums/conversion...71-c-10-a.html
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Old 10-09-2018, 10:04 AM   #5
scoobiedoo01
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Re: LS swap with PSI wiring harness

Okay. That was the wire I had figured but good to confirm it.

Thanks much!
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