Dometic Ac keeps blowing 12 volt fuse

It still doesn’t work and it’s HOT today

Thank you dougrainer for your help. I was able to get the ac and the furnace both working. I simply hooked it back up but left the one white/orange ,the one that must be shorting out, disconnected . Since I had two of the 12volt - wires . I checked and had 12 volt, not really sure why they have 2 of the same wires, you were right the control box was good.thanks again for walking me thru the process !

Tjpries1 wrote:
Thank you dougrainer for your help. I was able to get the ac and the furnace both working. I simply hooked it back up but left the one white/orange ,the one that must be shorting out, disconnected . Since I had two of the 12volt - wires . I checked and had 12 volt, not really sure why they have 2 of the same wires, you were right the control box was good.thanks again for walking me thru the process !

There are EXTRA wires that are NOT used coming out of the control box. You have Red Pos IN from the fuse supply. You then have a Pos output to the tstat. You found that someone had combined 2 wires and should not have and should have had a wire nut installed to prevent shorting. SOMEONE had to have combined those wires or you would have had this problem from when the unit was new. Doug

Tjpries1 wrote:
Thanks, I have determined it is one of the 2 white/orange wires that are wire nutted together, going to the 12- , while I had everything disconnected and the box out I thought I would twist the two wires together and it popped, with the box sitting on the counter. Do you know where those 2 wires go/come from and are they 12 volt negative as the 12- indicates? Thank you

Without the schematic I would not be positive. There should be a schematic ON the Galvanized box showing what the various wires are for. Doug