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The difference in OD between SXL and GXL is nominal - perhaps a few percent. The 6-gauge GXL @ Terminal Supply Co maybe the heaviest gauge cross-linked polyethylene easily available.
not to be mean or anything but i think a small generator would be a better idea
There have been plenty of times I could have used a quiet modest capacity generator.
Using the cab or frame for the ground path rather than running dedicated return ground legs should be adequate for your purposes. But as stated in the prior post (especially if using the chassis as the ground path and high-current additions), the various OE ground jumpers should be upgraded.
You wouldn't happen to know how much resistance the frame rails have would you? They are steel and not copper but there's more area. (The specific resistance of copper is 10.37, I think steel is around 10+ times that)
350 MCM cable in a 1" wire loom (poly or nylon would match the factory wiring, but I can go for the asbestos if need be) will be my "+" run from the AUX Batt to a junction under the center of the truck
How hot does the CAT get and what's the rule about running wiring (in loom) within a an inch or two of it? I don't know if I can run a 1" loom alongside the factory wiring loom, there may not be room. Factory loom is on the top of the outside of the left frame rail above the gas tank.
I don't like to drill, and I don't want to compromise the frame in any way. Any rules/pointer for making small holes in the frame for mounting?For the wire runs going from the center junction to the cab corner hole under the cab I made some "L" shaped pieces out of sheet-metal and stuck them on with 3M mounting tape, the loom clamp attaches to these (pic2).
350,000 cmils is between 4/0 and 5/0 cable. Even welding cable that size will likely be fairly stiff and a challenge to route. What's your criteria for specifying cable that heavy? Junction block studs for cable that heavy will need to be at least 1/2" diameter.
Run the cable outside the frame to insulate from exhaust heat where necessary, if possible, but near the top of the frame rail to help protect from road hazards....or share the existing holes used to secure the factory loom.