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Use trailer brake power for auxiliary power?

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Disclaimer: I don't have my MY yet. This may well be apparent when I pick it up.

With that said, what are thoughts on repurposing the brake power for auxiliary power on the 16v lithium battery MY's? If I recall, that is lower voltage.

The reason for asking is my camper's brake controller needs auxiliary power to function. It senses the brake light powering up and uses that to trigger the brakes. Keeping the fridge cool would be nice too!