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Current only flows in the 12v circuit when the 12v master is on. The current required to energize the relay is minimal, a couple hundred milliamps, but I would still switch it off when you park it. The easiest way is if you have a switch panel for your accessories just make the first switch the...

I quickly drew this up for you, it should work to keep the 12v circuit from backfeeding. Ignore part numbers, I just grabbed random parts for the schematic. Basically use a heavy duty relay/solenoid switched with a 12v master ON switch. If the disconnect on the ground is flipped off without...