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Old 08-14-2012, 06:08 PM   #1
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1976 31' Sovereign
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no 12 volt power

Returning from a recent outing I hooked up and noticed no 12 volt power. It appears all fuses are ok. Battery is charged. When I plug in everything works, but unplugged, no power. Any ideas where to start? It is a 1976 international. Thanks, JR
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Old 08-14-2012, 06:16 PM   #2
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Are you saying that when you have the trailer plugged into 120 volt shore power, you DO have 12 volt power?
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Old 08-14-2012, 06:21 PM   #3
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Check your converter or univolt for big 25 or 30 amp fuses that connect the converter output to the batteries. These are separate from the 12 volt fuse block. There should be one for the positive battery cable and one for the negative. If one of these are blown, the batteries are removed from the 12 volt circuits. The converter will still be able to supply 12 volt power to the fuse panel.

If you have a battery isolation switch, that could cause the same symptoms if it's in the isolation position or if it's broken and no longer able to join the batteries back into the 12 circuits.

Chris
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Old 08-14-2012, 06:24 PM   #4
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Sounds like the battery voltage is not getting to the distribution panel. There should be a fuse for plus and one for negative. There might also be a quickness disconnect on the battery cable. My trailer has one in the battery compartment which vibrates loose ever 3 or 4 years.
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Old 08-14-2012, 06:36 PM   #5
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Often times there is a large fuse in the negative battery lead. It may be necessary to follow the lead all the way to ground as they are sometimes not obvious
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Old 08-15-2012, 09:33 AM   #6
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I have no 12 volt power. thanks, JR
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Old 08-15-2012, 10:51 AM   #7
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Quote:
Originally Posted by reybs View Post
Returning from a recent outing I hooked up and noticed no 12 volt power. It appears all fuses are ok. Battery is charged. When I plug in everything works, but unplugged, no power. Any ideas where to start? It is a 1976 international. Thanks, JR
Hi JR,

You wrote: . . . "Any ideas where to start?"

It would help me to help you if you could explain what's actually happening. When you write "everything works" and "I have no 12 volt power", it's a bit hard to diagnose.

I'm confused when you write: "I hooked up and noticed no 12 volt power" and: "When I plug in everything works".

Would I read . . . I hitched the trailer to the tow vehicle and noticed no 12 volt power to the interior lights and accessories?

Or . . .

Would I read . . . I hitched the trailer to the tow vehicle and noticed no 12 volt power to the exterior towing lights?

I'm confused when you write: "When I plug in everything works"

Would I read . . . When I plug the trailer into the 120 volt shore power, everything 120 volt works, but nothing 12 volt works?
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Old 08-15-2012, 01:50 PM   #8
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problem solved

I took the advice of removing all fuses and found that one 50 amp that appeared fine, was not.. Thanks to all who responded. JR
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