1986 30P Avion trailer Electrical Problem

That model number for the fridge was on the outside access cover. The fridge has an auto light on the outside and a gas push button to turn the propane setting on or off. It also has a climate control switch on the inside upper door for the freezer. No voltage reading on the 12 volt wires that go to the fridge circuit board. the 30 amp fuse that keeps blowing is behind the monitor panel above the fridge. I read 13.2 volts at the fuse location. My fridge no longer works or the 12 volt stereo and the 30 amp fuse blows immediately when I replace it. There is an analog ampmeter on the same circuit by that fuse that has never worked. I wonder if that is bad and is shorted out.

Would you verify the model? Is this a number on the inside of door or in outside access?
Does it have lights above the doors?

Thanks for the suggestions. I have a 3 way dometic fridge RM2214R I will try those suggestions. The fridge has always worked fine since I've had the RV and I think it is a newer model. At least not the 30 year old original model. It looks brand new. There are two small glass fuses on the circuit board that are fine and I don't read any voltage with my volt meter at the 12 volt wires that go into the fridge circuit board...

Your refer could be a three way unit. LP, 12 volt DC and 120 volt. Blowing the 30 amp fuse could indicate that the unit is trying to operate on 12 volts DC and the heating element is grounded.
First what is make and model of refer?
Open exterior access, look at the stack on the right side, see if there is two small wires and two larger wires entering the stack. Follow the two larger wires back to the circuit board if equipped. Disconnect one of them. Tape it up and install new fuse. If the element is bad fuse will or should not blow.

Fuses see Amps, not Volts. Blowing fuse means high Amperage draw on the circuit it is protecting unplug the refer 12 volt and try again. You could have a frayed wire or a dead control board.