Originally Posted by northstar
2011 Forest River Flagstaff Fifth Wheel... refrigerator wouldn't work and stereo would not power on and the 40 amp fuses were blown.
Also when removing the fuse for the stereo and replacing it there was a very strong arch.
Hooking the battery up reversed will cause all the issues you are reporting. I am sorry to report that you likely have caused a lot of damage.
I suspect the power converter needs the two 40 amps fuses replaced at a minimum.
I also worry about the fridge main board (hope the fuses caught it); the Stereo (most likely fried); the Propane Detector (most likely fried); the furnace main board (hope the fuses caught it in time); and Power converter if the fuses did not blow in time to protect it.
The red wires go to the positive terminal on the battery and the black/white wires go to the frame (ground).