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As others have stated, trailer brakes and battery charging are 2 separate issues.
I am only going to reference charging. I'll ask this simple question.
Do you have shut off switch for your batteries? Is it set to off?
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2011 Chevy 3500 crewcab LTZ 6.6L DRW
2011 Apline 3450RL
Carl and Kathie 
Dog : Tucker
Cats: Beaudie and Jangles
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