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Old 04-29-2013, 04:39 PM   #1
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1999 25' Safari
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Battery drain while plugged in.

While camping with full hook ups I noticed my 12 volts lights starting to dim and my voltage meter read 9 volts. I assumed that as long as the trailer was plugged into a 110 volt outlet that I would always have ample 12 volt power as the 110 would be converted to 12 volt as needed. Is it possible to drain the battery while plugged into shore power?
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Old 04-29-2013, 04:47 PM   #2
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Yes, if your converter/charger is not working. First check the 120 volt circuit breaker to be sure it is on. Second check for blown fuses or a bad fuse holder in the charge circuit. For some reason your battery is not being charged by the converter/charger, and it should all be automatic.
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Old 04-29-2013, 05:01 PM   #3
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Yes. See possible causes, below:

* Battery(ies) are discharged.
* Battery(ies) are dry (electrolyte has boiled out, frequently from overcharging).
* One or more batteries have a shorted cell (this pulls the voltage down).
* Battery cable(s) loose or corroded.
* Converter defective, or blown fuse.
* 120 volt AC circuit breaker in power box is tripped.
* Shore power cable or connectors are defective (connector blades might be dirty or corroded).
* Shore power is out of spec (too high, too low, intermittent).

There are quite a few possibilities, so I'd check the ones that you can and post what you find. That will narrow down the remaining possibilities.

Troubleshooting is not difficult for the trained and/or experienced. Ask your RV friends and neighbors for help. Most likely, some will have had similar problems and can assist in finding and fixing the problem.

Good luck!
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Old 04-29-2013, 06:35 PM   #4
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Thanks

Thanks for your responses. I will check those items you mentions and see if I can figure it out.
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Old 04-29-2013, 08:15 PM   #5
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You probably have a switch for the converter. Make sure it's on. Ours is behind a front curtain.
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Old 04-30-2013, 04:51 PM   #6
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I'm having a similar problem. When checking it I discovered the 110V circuit breaker open. so I closed it. It popped open again in about 10 seconds, indicating a short somewhere. Any ideas? Can short in one of the batteries cause this?

Thanks
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Old 04-30-2013, 04:59 PM   #7
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Quote:
Originally Posted by sldflyfish View Post
I'm having a similar problem. When checking it I discovered the 110V circuit breaker open. so I closed it. It popped open again in about 10 seconds, indicating a short somewhere. Any ideas? Can short in one of the batteries cause this?

Thanks
A short in one of the batteries shouldn't affect your 120v breaker, it should burn the fuse between the converter-charger and the batteries. It may be that your converter charger has become a boat anchor, or that there's an unrelated problem on that circuit, or even that the breaker is just worn out. On a 2010 trailer I'd rate the last option as a low probability, but things happen. Is it a GFCI breaker or a regular one? GFCI breakers can be quite finicky.

One way to isolate the converter as a possible source of the problem would be to unplug it from the wall (assuming it wires in with a normal 3-prong plug) and turn the breaker on. If it stays on, the problem is in/near the converter. If it opens in a similarly short time, the converter is probably ruled out as the culprit.
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Old 05-01-2013, 01:55 PM   #8
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Thanks.

I'm going to check a few things and if the problem isn't obvious, it's off to the repair shop.
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Old 05-03-2013, 12:13 AM   #9
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It's the converter.
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Old 05-15-2013, 08:51 PM   #10
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Problem Solved

Quote:
Originally Posted by Jfuller678 View Post
While camping with full hook ups I noticed my 12 volts lights starting to dim and my voltage meter read 9 volts. I assumed that as long as the trailer was plugged into a 110 volt outlet that I would always have ample 12 volt power as the 110 would be converted to 12 volt as needed. Is it possible to drain the battery while plugged into shore power?
I tested the 12 volt distribution panel and discovered that the electrical post connecting the wire to the 12 volt fuse panel was bad. This was causing a partial connection - ie 9 volts as the lights dimmed and 0 volts when there was no 12 volt power at all.

I simply relocated the wire to the fuse box to another terminal and everything has worked perfectly since. Thank you to everyone who responded.
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