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Op, do you have a silverado? This seems to be a common upgrade for them and is my next mod to mine. I know it will help because my headlights dim when I hit the brakes, and according to my dash my alternator is constantly charging at 15.1v! Just the added load on the alternator's got to lower my mpg's by 1 or 2. It makes me wonder what gm was thinking when they put such small wires on everything. I don't think I'm going to do the fuse box cable, though. Just the alt-batt wire and both grounds. I haven't checked yet but I read the gmt900 trucks like mine grounds the battery to the engine, and then the engine to the frame, so I might add a ground from the battery to the frame as well.
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