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Old 03-10-2014, 11:57 AM   #1
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1978 29' Ambassador
Craryville , New York
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12Volt not working '73 Safari

Hi all- I have a 1973 Safari I'm restoring. I replaced the univolt with a converter (Progressive Dynamics PD9245: 45 Amp Converter with new fuse box). The 120volt works throughout trailer, but the 12volt does not. Trailer had the same issue prior to the upgrade. Also replaced the circuit breaker by the trailer plug, and 12V still not working. I have the converter grounded to the body (maybe it needs to be to the frame?).
Any ideas or recommendations to try?
Thanks in advance, Shawn.
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Old 03-10-2014, 12:08 PM   #2
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Do you have any batteries hooked up? If so, use a multimeter (or 12v test light) - starting at the batteries and go up to the 12v distribution panel and out to the circuits tracing for power (and ground).
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Old 03-10-2014, 12:19 PM   #3
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No don't have a battery at this time but did prior and that didn't help, however I didn't try the tracing as you suggested. I'll have to get another battery and try that.
Is it true that the 12volt should work if the trailer is plugged into the 120?
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Old 03-10-2014, 01:15 PM   #4
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12 volt should work when plugged in to 120, but better to have battery installed. Also 12 volt should work when tow vehicle plugged in. Maybe a silly question, but does your trailer have a 50 amp glass fuse in the battery neg. wire, mine did, it was mounted on the wall just inside the access door to the left. Mine had a dirty loose connector and until I found it I had intermittent 12V problems. Good luck.......Phil.
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Old 03-10-2014, 06:13 PM   #5
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Well I got lucky on this one. I noticed there was no ground on the fuse box, just the converter, so I grounded on the fuse box too and bingo, the whole system came to life. I'm glad to have this one behind me so I can be back on track with the resto. Lesson learned, if your installing a converter and fuse box, ground both of them.
Thanks for the input SilverHawk and pgr32e.
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Old 03-10-2014, 06:35 PM   #6
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Just a hunch, but you might have a long path to ground. Make sure your ground path is big enough and direct enough to run your entire load.
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