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The one above is to make the unit compatible with my factory brake controller in my truck (2012 Silverado). For Chevy or GMC 2007-2017, newer it is not needed. It's call a "HBA-CAM". Black one is a dedicated brake away battery/charger just for the unit. Required in my state. Not tied to the trailer 12 volt system. It is charged while connected to shore power (through converter) and truck when traveling. Has a test button to check charge level.
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