Howdy, I've got a Flagstaff by Cobra trailer, and when I set it up this spring had the following electrical issues:
On shore power, interior lights work, water pump and furnace do not.
On battery power, _nothing_ works, but the battery is charged.
On shore power, I put a voltmeter on the pump hot lead and get 12volts, but as soon as I turn the pump on the voltage drops to zero.
If I run a wire from the batter to the pump, the pump runs fine.
I'm guessing the reason the furnace doesn't work is it also isn't getting any power but I haven't trouble shot it yet.
Don't suppose anyone as a wiring diagram for one of these semi-oldies.
What year is it? You'd be surprised what people have hanging around.
Does it have a 12V converter? I would start by checking the fuses on the converter. Then make sure each 12V connection is secure.
Initially, it sounds like a badly corroded 12V connection, which would show 12V on an open circuit (no load), but would immediately drop to 0 when a load is applied.
Austin
A friend of mine had the same problem and it turned out to be a loose ground wire
Sounds like a poor ground. It will show 12v on the meter but when you put a load on it, it won't supply enough amps.......yep....bad ground (or corroded connection somewhere) would be my guess too. :sombraro:
Sounds the consenus is a bad ground so I'll check that. First I have to replace the winch since the entire socket/brake assembly fell off while I was towing. Luckily on the way home!
I had a similar problem. I ended up replacing the main lead from the battery to the converter. By the way I made sure to throw the old wire away so I wouldn't use it for something elese.