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I go to the welding supply and get the biggest cable they have. That is one area I want absolutely no trouble from. Welding cable will have far less voltage drop than a battery cable will and is also more flexable for routing.

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I ran the BIG welding cable for years but when I re did my interior, I had Napa make me a #2 iirc which was way smaller AND lighter and it works great. Like Mike said, the grounds are very if not MORE important the the lead wire.