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Old 07-06-2021, 10:36 PM   #2
ls1nova71
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Join Date: Dec 2009
Location: Independence Mo
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Re: ALT hook up , and Power to relay help

You don't have to splice anything on the alternator. The small wires go from the alternator straight to the PCM, nothing needs to be done with them. You will need the big red wire hooked to the battery though. Depending on how how did your wires, you may need to add the wire that goes to the firewall bulkhead that powers up the fusebox under the dash.

As for the relays, I assume you mean the main ignition relay, the one that powers up the LS harness, it will be hooked to the HEI wire, but only to turn the relay on, not powered up by it. It will need a constant power to power the relay.
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5.3 swap into my RUSTY '71 C10
http://ls1tech.com/forums/conversion...71-c-10-a.html
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