enblethen wrote:
Yes, it charges the battery while on the road.
Maybe. More correct, it prevents any significant discharging for loads in the trailer
(like the refrigerator) will running down the road.
Most (all?) modern vehicle charging systems are controlled by the PCM. They are quite accurate. The problem is 20-30' of wire to the trailer battery will cause a some voltage drop, likely enough to not fully charge the battery.
If you are starting with a fully charged battery AND have NO LOADS
(i.e. refrigerator off or on gas), then I would nor worry about B+ at the 7 pin connector.
