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Old 11-22-2019, 06:47 PM   #1
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Lost all 12v power on 5th wheel

So I lost all 12v power on my 2003 Keystone Challenger 5th wheel. It burnt the red power wire into the converter. So i pulled the converter and went to a well known part supplier and found a "new" old stock replacement. Replaced and still no power to the 12v.

My questions are these:

1) If the battery is dead (camper is plugged into 120/AC) will i still have no 12v power?

2) I have no fridge power is my fridge run off the 12v power and not 120/AC?

Any ideas maybe a bad replacement converter/?

thanks so much.
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Old 11-22-2019, 07:02 PM   #2
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Get out your volt meter. Fises and resettable 12VDC breakers would be my first guess.
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Old 11-22-2019, 07:22 PM   #3
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all replaced the old converter and fuse block. All fuses checked. Power in none out to the fuses block.

does the battery run in the series before the block? So what i am trying to say is if the battery is shot would that shut the system down?

Note: my camper is up on an island and im 370 miles away from it at the moment.
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Old 11-22-2019, 07:36 PM   #4
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30/40 amp reverse polarity fuses on the converter? Resetable fuse within 6' of the battery? Battery disconnect ON? 120 volt breaker to the converter ON?
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Old 11-22-2019, 09:33 PM   #5
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12V Power

I'd put my money on the batteries. How old are they?
For battery wiring it depends on the voltage and the number of batteries. If you have 4 x 6V golf cart batteries you have 2 pair of series/parallel
12 volt batteries are wired in parallel.
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Old 11-23-2019, 08:26 AM   #6
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Thank you all for the replies. I have a good start in troubleshooting.
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Old 11-23-2019, 10:04 AM   #7
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The converter should still provide 12 volt power even with no batteries at all as long as you are plugged in. Yes, most RV fridges are operated on 12 volt for the circuit board and may have a 110 volt option. They will still require the 12 volt system to be functional even on the electric option.

Check the converter fuses including the reverse polarity fuses. You can post the model of converter you installed for more troubleshooting tips. If you are getting power in but not out that is where you should start looking.
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Old 11-23-2019, 11:59 AM   #8
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If the red wire to the converter is burnt, something is seriously wrong. This issue should be addressed first.

Probably a hard short to ground on this wire. It could also be a bad crimp or connection causing heat to build up, and would be local to the bad connection.
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Old 11-23-2019, 12:10 PM   #9
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The fridge COOLS by 120 volt, but it's CONTROLLED by 12 volt. That little panel on the fridge where you change settings and such is 12 volt powered. Until you have 12 volt the fridge won't work. The same with the air conditioner, the thermostat is 12 volt (I realize it's the wrong time of year in Michigan need to cool the RV).
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Old 11-23-2019, 05:23 PM   #10
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I should of mentioned we are a seasonal on the island and that day we lost power on the island, i am guessing and only guessing that a power surge happened.


Parralex 55amp box
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Old 11-24-2019, 11:53 AM   #11
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Last week I blew the reverse polarity fuses on my converter. I was able to run the DC system off the batteries which obscured the fact that the converter want working. There was absolutely no DC with the batteries disconnected - no fridge, no led lights, nothing but the AC-only things like the microwave and TV. Once I replaced the fuses in the converter, I had all the DC panel working even with the batteries disconnected. I'll add that I blew several DC fuses when I blew the converter.

I downloaded the troubleshooting guide for my new converter and worked through its steps to find the problem, which was today I connected the black DC output cable to the black converter output. A handful of DC fuses later, I can tell you that was backwards.
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Old 11-25-2019, 10:19 AM   #12
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Quote:
Originally Posted by maxndale View Post
I should of mentioned we are a seasonal on the island and that day we lost power on the island, i am guessing and only guessing that a power surge happened.


Parralex 55amp box
Hindsight says you need a surge protector, too.

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Old 11-25-2019, 03:58 PM   #13
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Check your battery. . I had a converter go out my 12 volt power was going . Put a charger on the battery and it kept the battery charged and the 12 volt running .
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Old 11-25-2019, 04:29 PM   #14
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Just a thought 12 volt shutoff switch get turned
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