Hi I have a 2000 donzi zx and I am having trouble with the electric in the cabin. There is power to the battery switch and to the main braker in the panel. Now the only thing that works is the fridge in the cabin no lights water or radio. Now I do have full 12v power to the helm no issues there so now I'm lost. This has happened to me before but every thing started working again on its own. Also if I have the main braker on and the battery on and turn the fridge braker off the light in the fridge don't go off just gets really dim and flickers. Any ideas would be great thanks

Check your ground wires for the items that don't work you can have 12 volts coming in but if there's no ground to that item they won't work

Do the grounds usually go back to the engine compartment? I checked the ground bar on the back of the panel and all the wires are tight. Also cleaned the positive and negative terminals at the batteries and that didn't help.

Agree, check the grounds, and don't just look, take them off, inspect and make sure they are clean and shinny metal. Largest problem with most power issues is the manufacture didn't run a large enough wire to handle the load and/or they didn't seal the connectors. Don't seal the connectors corrosion develops

And will add sometimes the whole ground strip (ground block ) needs to be replace - can not tell you how many times I have seen that especially the ones mounted in the engine compartment directly below a water drip line from the engine hatch..

fridge is 110 or 12V?

you sure it's ground? you have positives to these devices?

Fridge is 12v only and has a barker in the panel with every thing else. The panel is half 12v and the other is shore power 110 and all of that is working just fine. Just the 12v is having the problem.

verify you have a full 12V at breaker, if not start going backwards with a meter, run a positive or ground from battery if needed to make sure you have ground and power one at a time