Posted by MarkB_MI on July 28, 2023 at 19:09:14 from (174.236.34.145):
A few weeks ago I did some umbilical wiring repairs on my fifth wheel camper. When was checking everything out, I discovered the trailer battery wasn't getting charged by my tow vehicle. It turned out there's a five dollar 30 amp fuse in the truck to protect that circuit, and it was blown. There's also a 30 amp circuit breaker on the trailer side, but the fuse blew first.
Since this discovery, I've added another check to my normal lighting checks: After hooking everything up but before starting the tow vehicle, I check the trailer battery's voltage. Then I start my truck and check it again, making sure that the voltage is higher after starting the engine. The voltage will only rise a couple of tenths, but it's charging.
I suspect the blown fuse happened when I ran the trailer battery completely flat trying to operate the camper's furnace during cold nights at Yellowstone. I now carry a spare fuse, but haven't needed it. We just finished a 1200 mile trip around Lake Michigan and had no electrical problems during the trip.
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