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‘01 Silverado 2500HD 8.1/Allison 5sp xcab long bed
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Starting at the core support, there will be one by the battery on the fender and one on the other side into the back of the core support for the headlights. Next, on the block, there should be two or three.

Back of the passenger head to the firewall, to the frame. At the fuel tanks, and finally left rear frame rail for the tail lights. Inside, there should be a gauge ground near the OBD port.
 

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Once you find all of the rounds you may want to sentralize them and run them back to the negative battery terminal. I've done this on both my Subbie and my Jeep CJ using a bimetal ground buss bar I pulled from a house fuse panel at Hab for Humanity. I ran 6 gauge from the negative battery temianl to it, then solder in new lines for all of the grounds I can find.
 
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