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Old 02-13-2018, 02:45 PM   #2
mongocanfly
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Join Date: May 2015
Location: Alabama
Posts: 14,606
Re: Which wires should I keep?

your tach wire will feed from ecm...I used the wire going to hei for my "switch on" wire [needed by ecm]...same wires for starter on sb will work on LS...temp sensor can still be used on passenger head, the ecm will use temp sensor on driver side head....the ecm wire harness will have its own alternator plug..but the "big" wire still needs hooked up,i connected that to the junction box on the firewall.......
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Mongo...aka Greg

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1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334
Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2023 Chevy Z71..daily driver
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