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Old 04-04-2012, 04:07 PM   #1
1 Rivet Member
1971 31' Sovereign
fresno , California
Join Date: Jul 2011
Posts: 11
no 12 volt electrical????

we got to our site plugged in to the 30 amp service but no 12 volt lights are working The 110 plugs,air, refrigerator are all working just no 12 volt. Any ideas, we just got this tradewind and are working out the bugs.Help please!!

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Old 04-04-2012, 04:29 PM   #2
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1991 34' Excella
Princeton , New Jersey
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First I would check the output of the convertor while plugged into city power. If nothing check the input side of the convertor to be sure it has power. If it has power but no output check any fuses that may be on the convertor.

Once you have output from the convertor check the trailer battery voltage. If you have both convertor output and battery voltage check the 12volt fuses or circuit barkers. I suspect the problem is before the fuse/barkers as it is highly unlikely that ALL would fail at the same time.

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Old 04-04-2012, 04:31 PM   #3
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1959 22' Flying Cloud
1969 25' Tradewind
1983 34' Limited
fairview , New Mexico
Join Date: Mar 2005
Posts: 574
Images: 85
Do you here a hum? The univolt converter for the 12 volts has a hum to it. There are also fuses for the battery. A positive and a negative fuse. On my 69 tradewind the converter is in the curbside rear compartment. The battery and fusebox are in the rear hatch above the rear bumper.

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1959 Flying Cloud
1969 Tradewind
1973 Safari
1983 34 ft Limited
2004 F250 superduty ext cab
2014 F350 longbed superduty crewcab
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Old 04-04-2012, 05:49 PM   #4
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1974 Argosy 26
Morrill , Nebraska
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Look for a fuse on the negative side of the circuit as well as the positive side. Can you hear the Univolt humming? Make sure all of the fuse holders are holding the fuses tight. Also, if the fuses are old. The element may have become disconnected from the end cap of the fuse. It may be best just to replace all of the fuses with new. Down the road you may want to consider replacing the Univolt with a more modern 3 Stage Converter.
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Old 04-06-2012, 02:25 AM   #5
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1969 18' Caravel
Jensen Beach , Florida
Join Date: Nov 2011
Posts: 32
This recently happened to me also (no 12 volt power). The connection between the battery ground terminal and wire was corroded. It looked good from the outside, but the wire had isolated itself from the clamp and without a ground to the battery no 12 volt systems will work.
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12 volt

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