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Old 11-16-2021, 08:04 PM   #10
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Join Date: Aug 2014
Location: Boulder CO

The big cables directly off the battery to the starter/engine are already sized to start the car (hundreds of amps). If you really have 140Amps of accessories (efan, search lights, A/C, earthquake stereo, arc welder), you might want to upgrade the smaller battery+ to junction box cable, the alternator-to-starter + cable, and the short alternator- to ground cable. They're probably ~10 gauge now, and going to 8 gauge would keep the voltage drop under a volt. Just make sure you crimp them really well.
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