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Old 11-02-2010, 02:30 PM   #1
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1973 31' Sovereign
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Battery not charging

My battery does not appear to be charging.

It measures 12.8V when disconnected or connected to the trailer with TV connected and running or connected to 110.

All fuses on univolt appear to be good.

When I take off the cover over the 7-way the large blue cord in the middle measures 14v with TV connected and running.

Any suggestions on where to start?

Steve
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Old 11-02-2010, 02:36 PM   #2
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I installed a battery kill switch so the battery stays disconnected except to raise and lower the jack, and I trickle charge it every time we get to a new place.
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Old 11-02-2010, 03:16 PM   #3
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Measure both sides of the kill switch while the trailer is plugged into shore current and or the TV while running. If you see 13+ volts on one side and 12.8 on the other that switch is isolating the battery from the converter and the TV.

Not sure why you put that switch in. How does your freg work while on the road if you have the battery disconnected?

Depending on where you put that switch you may have disconnected your emergency brake system also.

Rethink that switch.
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Old 11-02-2010, 06:04 PM   #4
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Would love to rethink the switch. I put it in temporarily BC i thought something might be draining the battery, but i had more urgent things to fix.

I'll check on both sides of the switch. I did have to just replace this battery 9before the switch) even though it was new in July. No doubt bc it wasn't being charged.
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Old 11-04-2010, 04:34 PM   #5
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So I just remeasured and I got 12.46 at the battery not plugged into the shore and 12.89 when plugged in. Does this mean the 110 is charging the battery properly?
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Old 11-04-2010, 04:54 PM   #6
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Yes it is charging. That may be a maintenance charge rate because it is only slightly above the current battery voltage. Depending on the type of converter you have, some chargers have 3 different charging rates.

If you want to test it further disconnect from the shore and run the battery down with lights and or the jack retest the battery when it is lower and then plug into the shore and see if the charging voltage is above the 12.8.
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Old 11-05-2010, 01:52 AM   #7
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Your Univolt is not charging your battery. If you saw 14 volts, that was bacause your TV engine was running and likely the only charge your battery has seen lately.
If you are reading 12.anything, you are not charging the battery from the univolt. It takes at least 13.5 to really do anything and that assumes a healthy battery.
Shut off switches (kill switch) is not the answer unless for some reason you don't want a parasitic load to drain your battery, ie CM detector, etc. Maybe during storage but even then a solar maintainer or modern multi stage converter/charger connected to shore power is the best.
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