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I have my fuse block wired, and only a few left to run in the cab. I can't seen to find anywhere that will tell you how big the supply wire should be going the fuse block. It is running the basic engine stuff, but not the starter or any fans. Just injectors, coils, trans, pcm, MAF, TAC, O2's ect... I have a #2 awg running from my battery to a factory junction block just above the PCM and new fuse block. My plan is to run a wire from the factory fuse block that is key on power to a relay that will power the new fuse block, and grab the power from the always on #2 wire above the PCM. I didn't think it would be good to draw from the factory fuse block to power the new one. What size relay should I use and what size wire should supply the block? I'm more familiar with house wiring than I am with 12v auto wiring.
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