Maybe my experience may help the supplemental brake problem. I have a 2014 Chev Sonic that I tow 4 down. When I went to hook up the power cord(which has a lighter plug end) I found that the power to the aux plug in does not work unless ignition is on. I bought an extension 12 v lighter plug and put small clamps on one end. these are attached to the battery posts and I run the extension from under the hood to the driver door and inside to the power cord for my blue ox patriot brake system. It draws very little amps and has not ever discharged my battery. Once I get to my destination i start the car and let it run for 15-20 minutes. something to consider?
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henryn,smithfield NC
2015 thor citation sprinter st
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