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Old 05-15-2019, 06:50 PM   #1
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Hidden fuse? Fridge, radio, Co2, sensor panel out

I have a 2009 Jayco 17 Ex-Port. Getting it ready and didn't have any 12 volt. Found the inline fuse at the battery blown so I replaced that. Everything came on except the Fridge, the radio, the little senor panel that shows the water levels,etc. and the Co2 sensor. So these must all be on the same circuit but I can't find a wiring diagram. Under one bed is the fuse center. I reset all the breakers and pulled each of the 15 amp fuses and made sure they were good with a ohm meter. I found a breaker under the fridge and reset it (though it wasn't blown). I check the power on the back of the fridge and I have 110volt going to the fridge and 12volts (actually it reads as -12volts). Finally, I unplugged the 110v from the camper to verify the 12v was powering lights and stuff and they were still good to go.

So I can't find any other fuses in the camper but since multiple things (all requiring 12v aren't working, I'm missing something! Any suggestions? Camping in 2 days so need help ASAP!
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Old 05-15-2019, 08:08 PM   #2
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Followup, I found two more 30 amp fuses in the inverter buried under the bed. It was awkward getting to them and they were in there tight. I finally got one out but it fell apart coming out so I'll have to figure out how to remove the inverter to get the rest of the fuse out. It does look like it has a burn mark so I'm hopeful that's it. I plugged the unit back into 110 and even without the second fuse, everything that worked before still worked and the things that didn't work (Co2, fridge, etc.), still didn't work. So hopefully I've figured out the issue and just need to figure out how to get the inverter out.
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Old 05-16-2019, 03:14 PM   #3
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FIXED

I did fix the issue. I removed the converter (a bit of pain to get to) and sure enough both the 30amp fuses were blown. The other thing that surprised me was that the fuses were being held in on a busbar with screws that, when tightened, cinch them in there good! So I had to loosen the screws before the old fuses would come out. While doing all this I also checked the AC cables coming to the converter and the ground was a little loose (might have been the original cause?). Anway, it's all back together and everything is running now! I appreciate the assistance and wanted to close the loop incase someone else had a similar problem in the future.

Mike
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Old 05-16-2019, 05:03 PM   #4
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The primary cause of the converter fuses blowing is hooking up the battery cables backwards. Even for a second will blow them.

They are called reverse polarity fuses and blow to protect the converter.
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