I changed our tow vehicle to a new Range Rover Sport recently. On our first trip, the batteries in our Airstream went dead on the first night--boondocking. Upon arriving at our destination for the second night, the batteries hadn't charged at all during the 5 hour drive. Long and short--there was no 12v
being transmitted from the tow vehicle through the wiring harness to the trailer.
I took the car to the dealer when we returned; they found that the 15A fuse through which power was supplied to the trailer had blown; they replaced it; and they said it tested fine at that time. To check, the next day I hooked up the RR to the trailer and there still seemed to be no power going to the trailer (based on the battery readout in the trailer). I then purchased a tester and found I was right--there was no 12v
power coming from the 7-pin connector. All the other circuits worked fine--turn signals, brake, brake lights, etc. When I called and talked to Airstream, they said that the trailer can't cause that circuit to overload, that the trailer only accepts whatever power is being supplied to it through that particular 12v
I'm stumped at this point and am wondering if the dealer might have installed the Tekonsha brake controller incorrectly and somehow has messed up the wiring causing that particular circuit to overload. Right now the wiring harness plugs in correctly, everything works except there's no 12v being supplied to the trailer. Anyone have similar issues--or thoughts?