To answer your question yes, the Trailer Breakaway Kit Battery Charger part # 20011 can be used to charge your breakaway battery while drawing power from the 12 volt auxiliary battery on your trailer. However, most local and state regulations require that the breakaway battery receive a charge from a battery not mounted on the trailer therefore, I recommend using the Trailer Breakaway Kit Battery Charger part # 20011 to pull power from the vehicle's battery via the 12 volt pin on the 7-way... view full answer...
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