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68 GMC 3/4 ton what are these wire coming out the firewall?
Right around the harness connecter there are 3 single wires that come through the firewall. There was a 305 v6 in the truck originally. I figured out the lower wire was the factory tach but the 2 above I am not sure. The one toward the outside is hot all the time. The one closer to the inside powers up when the ignition is turns on.
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