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Old 01-03-2018, 05:51 PM   #8
ray_mcavoy
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Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,350
Re: 66 C10 Engine Wire Harness w/ Gauges and HEI

You'll want to get the 56-series terminals that match the size of the wire you'll be using. 12ga is what's most commonly used for the circuit powering the HEI distributor. If you are planning on adding in the wiring for the factory battery gauge, that uses smaller 18 or 20ga wire (and, as shown on my website, I recommend adding some 4 amp inline fuses to both legs of this circuit to make it safer than the factory un-fused configuration). Note that there are some 56-series terminals designed to accept 2 wires together in the crimp cavity (they're usually listed with the word "double" along with the wire gauge) but I don't think you'll need any of those for this project.
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