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Old 08-23-2015, 07:21 PM   #1
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Interior lights not working

Hi everyone. I could use a little help here. I have a 1998 Jayco UD10 pop up. I just bought it. The interior lights and power work fine when connected to the battery. The outlets work fine when connected to 110 vac too, but the interior and exterior lights do not. The fuses in the breaker panel look good. Since the lights work when connected to battery, that means it's not a wiring issue, right? What am I missing. Why won't the lights work when plugged in to 110? Help!! Thanks.
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Old 08-23-2015, 07:24 PM   #2
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Are you saying they won't work at all plugged in? They are likely all 12volt lights and there are no 110 fixtures, but he 12v should still work.
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Old 08-23-2015, 07:31 PM   #3
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Yes, I am saying no lights will work when the camper is plugged in to external power, but the outlets do.
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Old 08-23-2015, 07:37 PM   #4
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Are the battery's charged? Try here and see if you can find the problem
The 12 Volt Accessories On My RV Don't Work When We Are Plugged Into Electric.
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Old 08-23-2015, 08:10 PM   #5
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Are the battery's charged? Try here and see if you can find the problem
The 12 Volt Accessories On My RV Don't Work When We Are Plugged Into Electric.
Not sure what you mean by batteries? You mean the deep cycle marine? That's brand new today, and fully charged. I'm wondering if it might be a converter issue as the outlets are all that work when the unit is plugged in.
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Old 08-23-2015, 08:14 PM   #6
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Yes the deep cycle. It maybe a converter problem. RV Camper Power Converter How To, Troubleshoot, Repair, and Replace the Converter FAQs
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Old 08-25-2015, 01:06 PM   #7
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you should find a micro switch up in the outside of one of the corners of your roof. It shuts the power off to the interior ceiling lights when you lower the roof. Check that before tearing your hair out. Larry
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Old 08-25-2015, 01:17 PM   #8
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X2 19h f250
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Old 08-25-2015, 01:30 PM   #9
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There should be two 30 amp fuses (green) in the converter. One is the main fuse to connect the converter to the 12V system. The other is a reverse polarity protection fuse to protect the converter if the battery is connected backward. Likely one or both of theses fuses are blown. If this is the case your battery is not being charged either.

If that is not it you may well have a bad converter.

The switch that 19h f250 is referring to will not be the problem. If it were the lights would not work on battery either.
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Old 08-25-2015, 02:00 PM   #10
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It always concerns me when someone says the fuses LOOKED good OK did you look at the battery and say it looked good also or did you test the battery? Same thing with fuses Looks can be deceiving. Always test Fuses and Battery and anything electrical with test meters or circuit testers
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Old 08-29-2015, 09:10 AM   #11
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My converter has a 15 amp circular fuse button that I push in to use when plugged in. Not familiar with your converter. I like to keep things simple and go from there. Even though the fuses app like they are ok replace them. Also check that micro switch in the corner as stated by 19H F250. I don't have one of those, but my pup is 30 years old.

It took me a few tries to figure out how it all worked. I'm sure you will also.
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Old 08-31-2015, 07:30 PM   #12
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Thanks all.... 19H, The micro switch is good. Bedrck, I replaced all 4 automotive fuses anyways, just in case. No luck.

Tnchuck, I will try to find the interior fuses, I did have the converter out once and didn't notice any other fuses, but I will take another look.
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Old 08-31-2015, 07:46 PM   #13
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I'm leaning toward the theory that your battery is connected backwards. Black should be connected to positive (+) battery terminal and white to ground (-). That is reverse from what you might think. The lights will work wired either way, but when you plug into shore power, the converter will shut it all down.
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Old 08-31-2015, 08:01 PM   #14
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I'm leaning toward the theory that your battery is connected backwards. Black should be connected to positive (+) battery terminal and white to ground (-). That is reverse from what you might think. The lights will work wired either way, but when you plug into shore power, the converter will shut it all down.
Battery is wired properly. I double checked...
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Old 09-03-2015, 07:27 AM   #15
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At this point I'm thinking it's the converter. Still have to check for any interior fuses I may be missing. Looks like a wfco8735p will be my option.
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Old 09-03-2015, 07:35 AM   #16
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Before you replace the convertor take it apart There may be a internal fuse on the circuit board that may be blown.
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Old 09-03-2015, 05:22 PM   #17
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I will. That will be this weekend. I'll let you know.
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Old 09-05-2015, 02:27 PM   #18
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Hey Bedrck..... I am doin' my happy dance!!! It was just what you suggested I check. There was a little 5 amp 250 volt fuse inside the converter on the circuit board that was blown! Fixed it for $3.49 and have spares. Thank you very much. I'd have never known to check there! Yesss!
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