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Old 06-28-2019, 10:45 AM   #1
Mattchu60
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Need help finding a Crank/Run Wire for 5.3 swap - 87 Silverado

I'm working on the wiring for my LS swap -wiring is not my strong suit. I have a premade harness which really helps, but I need to find a wire to connect the harness to that works in Run/Start. I tried reading a wiring diagram, but I'm lost.

I'm sure this is pretty straightforward for most - this is a 87 TBI Truck. I still have the original wire harness in place, its just all disconnected on the engine side (since the engine is gone). Is there a wire i can cut and splice into for Run/Start?
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Old 06-28-2019, 12:14 PM   #2
mongocanfly
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Re: Need help finding a Crank/Run Wire for 5.3 swap - 87 Silverado

i assume your talking about your switch on power...i used the switch on power wire that went to the hei on mine
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Old 06-28-2019, 12:18 PM   #3
Mattchu60
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Re: Need help finding a Crank/Run Wire for 5.3 swap - 87 Silverado

I believe that is the one - power to the LS wire harness fuse block.

There are a few HEI wires - any idea which one I'm looking to splice into?
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Old 06-28-2019, 12:57 PM   #4
ls1nova71
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Re: Need help finding a Crank/Run Wire for 5.3 swap - 87 Silverado

The main one is pretty good size, usually tan in color if I remember correctly.
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Old 06-28-2019, 04:18 PM   #5
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Re: Need help finding a Crank/Run Wire for 5.3 swap - 87 Silverado

yep..its the biggest wire in that plug...i think tan is correct..but its been awhile since i did mine
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