Help with camper electric jacks!
I need some pretty urgent help with my camper. I went to put down the front set of electric Atwood jacks on my camper this afternoon, and they worked intermittently. They didn't work at all at first, ...
Forum Discussion
Kawasakiklx wrote:
The fact that I'm getting a positive and negative from two chassis grounds is troubling. I'm not understanding the reverse polarity concept I think. The green wire is grounded to metal on jack. Between that and camper frame, should I have 12v positive?
Good video! If you did it in the dark you would be seeing fireworks!
The motor is shorting, thus the jack becomes 12vdc... the camper, jack bracket and jack body should be all grounded.... The motors are internally isolated so it can run both CCW and CW.
If the motor shorts internally then it will normally trip the thermal breaker or blow a fuse....
There is suprisingly enough resistance of the short in the motor and the area where the sparking occurs to keep things from blowing/tripping the fuse/breaker.
Disconnect the wire on this side where the arcing is occurring and try the other side by itself.. I can not imagine both motors being shorted.
There might be enough water in the jack motor to create this condition, just a thought.
The battery negative is part of the camper ground..... That is why the motor internally has to be isolated from it's outer shell. Most DC motors are like that. Other wise they could only turn one direction!
Jim
