What wire should I use for 12v?

When we install a 7-Way, we run the 12V power supply wire directly to the battery positive terminal with an automatic circuit breaker of 20, 30 or 40 amps, such as part 9506P, 38630 or 9510. If you use a circuit breaker of 40 amps, you will definitely want to use a 10 gauge wire.

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