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6. Power for the system comes directly from the battery. Villa used four-gauge wire to carry power to the Buss circuit breaker and then on to the command center inside the vehicle through a factory rubber firewall grommet. The Buss circuit breaker is waterproof, so it was OK to mount underhood. We chose to fasten it with Velcro to the top of the plastic battery enclosure. It won't hinder battery removal and the circuit breaker itself is easily accessible.