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Old 05-06-2019, 08:23 AM   #1
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No 12 Volt power from battery, problem solved

I was prepping my Palomino for the season. I installed the battery (fully charged) but was not getting 12 volt into the camper. I plugged into 110 power, and the 12 volt system works as it should. So I began checking fuses. I pulled every 12 volt fuse in the camper, all were good... rechecked the battery to make sure it was connected correctly (white, ground to the negative terminal, red, hot to the positive terminal). The power jack was working (it's connected directly to the battery) so I knew the battery was connected correctly. Since I was there, I pulled the ground connection, sanded the frame and cleaned the wire connector and reconnected.

I grabbed my old tester and started checking volts. The battery had 12.78 volts, but zero at the 12 volt fuse panel. When plugged into 110, the fuse panel had over 13 volts. I even drug the battery into the camper and ran wires from the battery to the fuse panel, and the 12 volt system worked... So I'm now sure the issue was between the battery box and the fuse panel. I knew I needed to trace the wires from the fuse panel to the battery box. I crawl under camper following the wiring from the battery to the fuse panel. I found a self resetting fuse, a rusty crusty self resetting fuse. I ran a temporary wire from the hot (negative) side of the battery to the out side of the self resetting fuse... we have power... So I ran to the auto parts store and picked up a 30 amp self resetting fuse. I swapped it out and now all is well is my world.

If you're sure the battery is connected correctly, and you're not getting power into the 12 volt fuse panel, trace the wires looking for a self resetting fuse. That could be your problem.
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Old 05-06-2019, 09:13 AM   #2
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One of the first things I did was getting rid of those circuit breakers.
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Old 05-06-2019, 09:34 AM   #3
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Common issue reported here often.

Glad you found it.

Many have reported putting those re-settable 12v circuit breakers in a weather resistant box or spraying them with a good anti-corrosion film.
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Old 05-06-2019, 09:41 AM   #4
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Quote:
Originally Posted by 5picker View Post

Many have reported putting those re-settable 12v circuit breakers in a weather resistant box or spraying them with a good anti-corrosion film.
I think putting the breaker into something is a good idea. I'm sure I can fab something to keep it out of the weather.

Thanks for the tip
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Old 05-06-2019, 09:45 AM   #5
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Quote:
Originally Posted by eprovenzano View Post
I found a self resetting fuse, a rusty crusty self resetting fuse. I ran a temporary wire from the hot (negative) side of the battery to the out side of the self resetting fuse... we have power... So I ran to the auto parts store and picked up a 30 amp self resetting fuse. I swapped it out and now all is well is my world.

If you're sure the battery is connected correctly, and you're not getting power into the 12 volt fuse panel, trace the wires looking for a self resetting fuse. That could be your problem.
Glad you got it figured out. Many RV's have a manual reset 12 volt DC circuit breaker, which is the problem a lot of times. We even keep a sticky in the FAQ section about it.

12 Volt DC Circuit Breaker with Manual Reset
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Old 05-06-2019, 01:47 PM   #6
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I always keep a spare in my toolbox. I've replaced a couple since we bought our unit in 2012.
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Old 05-06-2019, 02:03 PM   #7
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Quote:
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One of the first things I did was getting rid of those circuit breakers.
They are installed to protect the wiring and prevent a fire.

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Old 05-06-2019, 02:16 PM   #8
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I always keep a spare in my toolbox. I've replaced a couple since we bought our unit in 2012.
Think I will due the same
Thx
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Old 05-06-2019, 03:20 PM   #9
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Yep, a tripped resettable circuit breaker is probably the #1 cause of no 12v power but everything works with shore power.
Most times is from crossing the wires when the battery is being reinstalled.
I've lost track of how many times this happens and how many times a pic of the breaker is posted.
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Old 05-06-2019, 05:01 PM   #10
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They are installed to protect the wiring and prevent a fire.

LOL. Yes. Which is why I put in a way more reliable breaker away from the elements.
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