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Old 09-11-2007, 05:59 PM   #15
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1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,193
Quote:
Originally Posted by Zeppelinium
If it's the water pump, you should hear it when you enter the trailer. This happens to me frequently because I'm too damn dumb to remember to turn it off. What happens is an air bubble gets bounced up into the impellor and the pump starts running due to some pressure fluctuation. It can't prime itself due to all the faucets being closed and the back pressure. So it sits there and runs.

But your TV charging line should prevent the pump from running the battery down. You have a real mystery.

Zep
But if the Univolt had an internal short, it could charge the battery when plugged in, and discharge it just as quickly when unplugged. I am only dwelling on this, because it happened to us with our Sovereign. It would charge, then I would unplug it, and return to the storage lot, and a day or two later, the battery was dead.
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Old 09-11-2007, 06:07 PM   #16
Well Preserved

 
1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,193
Now, here is how to check for a draw:
1- Make sure the battery is fully charged to begin with, then unplug the main power.
2-Remove the negative battery terminal, and place a test light between the terminal, and the negative post of the battery. If there is a draw, the test light will light.
3-If the test light does not light, hook the umbilical to the tow vehicle, and retest, with the tow vehicle both running, and off.
4-With the test light lit, disconnect fuses one at a time until the light goes out. That circuit contains the draw. If you remove all the 20 amp fuses, and the test light is still lit, the problem is probably in the Univolt. Disconnect it from the system, and the light goes out, you have narrowed the problem to the Univolt, and can replace it.
5-If the test light remains lit, check for non-stock items that are wired directly to the battery, such as a radio amp, or TV antenna booster.
6-If the test light never comes on when performing this test, remove the battery and take it to be checked, it may have a problem that causes it to drain itself.
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Old 09-12-2007, 09:24 PM   #17
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1976 24' Argosy 24
Tucson , Arizona
Join Date: May 2007
Posts: 7
Good suggestion on the water pump, but no. I've been towing dry and the water pump has been switched off throughout.

Unless this problem has appeared in the last month, I can say that the Univolt is not discharging the battery, because it was holding the charge fine when disconnected before that.

Terry, that test sequence is great, guaranteed to isolate the problem one way or another. I will carry out this test and report back (the trailer is in storage and this test will have to wait until I next visit it).
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