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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: Banjobend on March 25, 2025, 02:08:53 pm
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Hey all, I have a 78 c20 and Im dropping a new engine in it. Its a vortec 383 and I will be running the serpentine belt setup and 4 wire alternator. My current cluster has only idiot lights but I have an original with all gauges. Looking online I only need one wire to run the 4 wire alternator and my setup currently has 2, one signal wire and one to the charge indicator. Im wondering if I can reuse the charge indicator wiring to run the gauge or if I should leave that out and wire a new switched source to the gauge.
Ive attached a diagram of what I'll be running at the alternator, everything else is stock GM.
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SI to CS pigtail. If you are going to gauges you need a resistor https://www.novaresource.org/alternator.htm