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Old 09-11-2020, 02:05 PM   #1
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1988 34' Limited
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Battery Master Switch Question

Another question for you AS electrical guru's.

The manual for my AS says that plugging the trailer into 120v power with the master switch off will blow radio fuses and may damage other 12volt components.

I'm trying to figure out why. Do I need to worry about that little blurb since we no longer have the original univolt system and have a converter installed? It also doesn't seem the converter is installed correctly as the 12v+ conductor goes to the 12vdc distribution panel instead of the battery side of the kill switch.

Thanks and I appreciate any thoughts!
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Old 09-11-2020, 02:35 PM   #2
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Things that make you go "huh".... Master switch off???

I would say that there's probably a power surge going through the old Univolt where the DC output would be much higher than 12.7 volts. Since you changed the Univolt to a newer model of converter I'd say you'd be OK. You can always do a voltage check on the radio at the fuse or some other easily accessible 12 vdc device with all other 12 vdc devices turned off and the master switch on. My 2˘
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Old 09-11-2020, 06:37 PM   #3
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The old Univolt converters were unregulated power supplies and relied on the batteries to filter and regulate the 12 volt power. Most newer converters put out high quality power and can run a trailer with no risk of damage.
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Old 09-11-2020, 06:53 PM   #4
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Quote:
Originally Posted by Al and Missy View Post
The old Univolt converters were unregulated power supplies and relied on the batteries to filter and regulate the 12 volt power. Most newer converters put out high quality power and can run a trailer with no risk of damage.
That fills in the puzzle piece I was looking for, thank you!
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