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Locate the 12 volt fuses. Not all coaches have them in the same location. Some are in the power converter, other locations are inside cupboard doors . Once you discover the location of the fuses, one of them will need to be replaced.
If you use too large a fuse, the wiring can catch on fire, and the whole car could burn up. You'll need an auto electrician to trace that problem. You can remove any bulb and unplug any device that is on the Acc(essories?) circuit; then see if a fuse will stay; start replacing items till you blow the fuse. It seems like a dead short which can surely melt wires if you keep taking chances. good luck.
Where do you have a 9 volt? I'm assuming you mean the outlet that we used to call the cigaret lighter? If so, it's a 12 volt outlet. Its pretty common for this fuse to blow, I'd definitely check that first. Get a few fuses because it likely blew from a bad accessory you plugged into the outlet. Also, try a few different accessories and verify that it's not an issue with the one you're plugging into it. If you replace the fuse and it blows again then the problem is being caused by whatever you're plugging into it.
I think you need to look inside of the sockets for foreign objects such as change or foil from gum wrappers. This is the most common cause of this problem. If it is all clear we need to unplug both and put in a new fuse, plug in one and then the other, see which one is the bad socket.
Refrigerators should never be plugged into a GFI due to the start up amps that it draws on start up. With other items on the same circuit it is too much of a load. Refrigerator need to be on there own individual circuit to keep this from happening and not a GFI. Hope this helped.
You mean there seems to be no power to the vehicle's lighter unit outlet.
This lighter unit outlet is normally wired through its own fuse so check the fuse panel in the car for a blown fuse. If blown it must be replaced with a fuse of the correct amperage. The owner's manual will show you where the fuse is located.
Before you check the fuse just check the cigarette lighter outlet with another plug-in device if you have one such as a portable 12 volt tire compressor or a 12 volt plug-in auxiliary light. It could be that if you are using a charger from the outlet, the charger plug or wiring may be faulty rather than the car's power outlet itself. (These outlets don't usually give trouble unless the wiring has been messed with or the outlet itself has been damaged or abused).
If no device works from the lighter power outlet check the fuse as it may be blown.
Even thought the plug in is 12 volt. It's ouput is different. Most electronics have different ranges from 3-9 volts. Does the 12 volt charger put out 12 volts? If so, it would burn up the electronics' capacitors on their power supplies. How is the car's electronics doing? Are they too failing? If so, that would be a faulty voltage regulator, if not, I would hook up anything you use to the radio wires. You cannot plug in anything directly to battery no matter what the person told you. Batteries charge, than release charge, a contiuous cycle. The power output is speratic and anything hooked straight up to the battery will need a fuse.
Induction coil heaters draw very high amperage (12-14 amps) when turned on. If your outlet is worn or old the heater plug prongs will not have a good connection and the current will jump or arc from the outlet to the heater plug prongs. This arcing causes tremendous heat, enough to melt the outlet and the cord end. First thing to do is change the outlet.