ok it's the main fuse that's on the outside 12 camper battery. camper was ok for 2 days in the driveway, walked in side camper. fridge light is... check fuse on outside 12 camper battery, try new fuse it blows out. ok turn off all 120 volt breakers, thinks that might have something to do with it. blow another fuse, pull all 12 volt fuses in the panel ,,blow another fuse,,un plug fridge 120 volt..blow another fusei'm lost on what to do ,no 120 power to the camper, all 12 volt fuses pulled, but still blow another fuse. only have 1 day till trip. looking for help.notesit has not rained in 5 days,it ran for 2 days then problem. never had a problem with this the camper. lost on why it's blowing fuses.

It sounds like to me that both the 120 and 12 volt systems are blowing fuses, is this correct? The only item common to both systems is the converter. Could you disconnect both the 120 volt and 12 volt from the converter and see what happens? Could be an internal short in the converter transformer causing the problem. With converter disconnected all plugs in the camper should work if it is the problem. Also 12 volt items should work off battery.

Could you disconnect both the 120 volt and 12 volt from the converter and see what happens when i walked in the camper i had a 120 volt fan on the table that was working , then i noticed the fridge light out, so i 120 volt is ok, it's the 12 volt that's blowing the fuse. so i closed all 120 breakers, and it still blowing fuses, 12 volt fuse at the battery, no power going in,, 120 unpluged, all all 12 volt fuses pulled from the panel too and it still blowing fuses at the battery.

Always suspect the last thing that was touched. What have you done with the battery or nearby in the two days you have been getting ready? What wires have you connected/reconnected?

X2 on having batteries installed in reverse... The way I do this is always make a mental note of the words "NEG" or the SYMBOL "-" on the 12VDC battery case. This terminal must go to the trailer FRAME GROUND which will be close to the installed battery.If it is installed wrong change to the correct position and then change the close-by INLINE FUSE as well as two fuse on the 12VDC Power Distribution Panel labeled REVERSE POLARITY.let us know what you find...Roy Ken

BFL13 wrote:Always suspect the last thing that was touched. What have you done with the battery or nearby in the two days you have been getting ready? What wires have you connected/reconnected?that's the problem , i was not doing anything to it. it was in the driveway all winter, put battery in tray , sat in the driveway , all was good, went for a 5 mile drive to get inspected ,, all good.. back in drive way for 4 days ,, all good , today the problem started with the no 12 volts. i did not do any thing to any thing,, that's the problem. i just cleaned the cables and the ground on the trailer, same thing , blows the fuse as right away , looked under the trailer and their is nothing different,, ie everything look like it should.

blowing 12 volt fuses | Good Sam Community

BFL13
Explorer II
Jun 23, 2013
So you actually played with wires by installing the battery and connecting up the 7-pin and then disconnected, you had the breakaway switch wire in there that might have got pulled by mistake, who knows? Any water tank heaters on by mistake?

First disconnect the battery bank entirely and plug in shore power. You should have 12v from converter. yes/no. if no, check the two? 30a? reverse polarity fuses. Replace all not just any blown.

Now, rewire battery and do it right, and hope for the best.
kennyzzz
Explorer
Jun 23, 2013
BFL13 wrote:
Always suspect the last thing that was touched. What have you done with the battery or nearby in the two days you have been getting ready? What wires have you connected/reconnected?

that's the problem , i was not doing anything to it. it was in the driveway all winter, put battery in tray , sat in the driveway , all was good, went for a 5 mile drive to get inspected ,, all good.. back in drive way for 4 days ,, all good , today the problem started with the no 12 volts. i did not do any thing to any thing,, that's the problem.
i just cleaned the cables and the ground on the trailer, same thing , blows the fuse as right away , looked under the trailer and their is nothing different,, ie everything look like it should.
RoyB
Explorer II
Jun 23, 2013
X2 on having batteries installed in reverse... The way I do this is always make a mental note of the words "NEG" or the SYMBOL "-" on the 12VDC battery case. This terminal must go to the trailer FRAME GROUND which will be close to the installed battery.

If it is installed wrong change to the correct position and then change the close-by INLINE FUSE as well as two fuse on the 12VDC Power Distribution Panel labeled REVERSE POLARITY.

let us know what you find...

Roy Ken
BFL13
Explorer II
Jun 22, 2013
Always suspect the last thing that was touched. What have you done with the battery or nearby in the two days you have been getting ready? What wires have you connected/reconnected?
kennyzzz
Explorer
Jun 22, 2013
Could you disconnect both the 120 volt and 12 volt from the converter and see what happens
when i walked in the camper i had a 120 volt fan on the table that was working , then i noticed the fridge light out, so i 120 volt is ok, it's the 12 volt that's blowing the fuse.

so i closed all 120 breakers, and it still blowing fuses, 12 volt fuse at the battery, no power going in,, 120 unpluged, all all 12 volt fuses pulled from the panel too and it still blowing fuses at the battery.
Dr_Quick
Explorer II
Jun 22, 2013
It sounds like to me that both the 120 and 12 volt systems are blowing fuses, is this correct?

The only item common to both systems is the converter. Could you disconnect both the 120 volt and 12 volt from the converter and see what happens? Could be an internal short in the converter transformer causing the problem. With converter disconnected all plugs in the camper should work if it is the problem. Also 12 volt items should work off battery.

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blowing 12 volt fuses

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