Hot Ground???
Alright, so after replacing my batteries I thought that our problems were solved. Especially when we arrived after two weeks to fully charged batteries in the storage yard(The refrigerator was hot how...
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Not sure I would be trouble shooting using current flow or ammeter setting. Especially since you mentioned blowing a fuse. A shorted appliance and using an ammeter can damage the meter. You can use the voltage scale and easily locate an open ground. If you have an open ground most likely problem is where it connects to the frame. Either at the battery end or the appliance end. Measure voltage across item in question. If no voltage move the negative probe to the battery terminal negative post. If you have voltage the ground is open. If the fridge worked before and blew a fuse could be a bad circuit board. If the fuse is blown I would remove the positive lead from that board, replace the fuse and measure the voltage. from the positive wire you removed and the ground on the board. If you measure 12 volts you have a problem with the board. In fact that is the test I would try first. Hope that makes sense.
