The Vansco unit monitors the voltage of the chassis and house batteries and then operates the large relay that connects both battery banks together. This relay is on the back wall of the battery compartment. Yes, the alternator charges the house batteries. The #19 LED on the Vansco in the battery compartment is lit when this relay is operated.
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2005 38FDTS
2011 Ford Edge
Fredericksburg, TX
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