Picked up new to me camper Trail Cruiser c191 (Hybrid) travel trailer.Battery was quite low so put a charger on it, while still connected to the camper. This morning I go out to check the voltage of the battery and it is "boiling". I had disconnected the power to the the charger so there was no charging overnight. This morning the charger was humming and the battery is 'boiling' (hot, battery acid coming out the top). I disconnected the charger and disconnected the battery from the camper. It was almost as if the power was flowing from the camper to the battery (camper plugged into shore power - regular house extension cord).When I went inside the camper my fuse panel was humming YIKES. Needless to say, I disconnected the extension cord.Anybody have any idea what on earth happened?Thanks so much!

Plugged in to shore power means converter was running and charging the battery. Adding another battery charger to this is only going to cause the battery to be overcharged. That sounds like what happened. Make sure your converter has a multi-stage charge capability. This allows it to charge the battery and then it backs off and maintains the battery. Adding a second charger is not the thing to do.

cmcdar wrote:Battery was quite low so put a charger on it, while still connected to the camper. This morning I go out to check the voltage of the battery and it is "boiling". I had disconnected the power to the the charger so there was no charging overnight. This morning the charger was humming and the battery is 'boiling' (hot, battery acid coming out the top). I disconnected the charger and disconnected the battery from the camper. It was almost as if the power was flowing from the camper to the battery (camper plugged into shore power - regular house extension cord).Need a bit of clarification.It sounds as if the camper has a converter/charger in it already, but, you said 'battery was quite low'. Do you mean voltage? And if so, was the camper plugged in when you took that reading? Power is supposed to flow to the battery if there's an on-board charger.Did you check the battery water? How old is this battery? I imagine very few used trailers have a) a good battery b) good tires.One or both of your chargers is a stupid one, and was overcharging.

Hi,The battery is three years old. Yes, I checked the battery water and all cells were full. This is a 2007 camper but the newest one I've had til now was a 1987 so I was not aware that shore power would charge my battery. HOWEVER, I disconnected the power cord from the battery charger and used it for my "shore power". IF the battery was bad, do you think that might have caused the problem?The battery did have enough charge to power my 12v lights but not enough to power my new LED replacement bulbs.Thanks for any incite.

There's no harm in running two chargers in parallel. They will either share whatever current the battery will accept, or one will contribute little to nothing, while the other carries the load. The "boiling" is likely a result of too high a voltage coming out of your on-board converter.Power up the converter while disconnected from the battery, and check it's output voltage. Should be in the 13.6v range, or whatever is listed as it's "nominal" output voltage. Then connect it to a slightly depleted battery and observe the voltage. Should be no more than 14.4 - 14.8v (the converter's bulk voltage setting).Post the make and model of your equipment... battery, charger, converter-charger for more help.

Measure the voltage but the battery probably has a shorted cell and should be used as a core when you purchase a replacement.

HELP Electrical problem! | Good Sam Community

SCVJeff
Explorer
May 03, 2015
Hopefully he now has one...
jrnymn7
Explorer
May 03, 2015
he or she? OP's name is caryl.
jrnymn7
Explorer
May 03, 2015
By chance, are the LED's on the 120v circuit, not the 12v circuit?
2oldman
Explorer II
May 03, 2015
jrnymn7 wrote:
he or she? OP's name is caryl.
Most likely a he.
cmcdar
Explorer
May 03, 2015
It was the "bad" battery. Once replaced, everything was fine.

This is a camper, disconnecting the battery involved one pos connection and one neg connection????

I do have a meter as I reported in previous posts that I was checking the voltage...

OP is a woman who has decades of experience in home building, repair, remodeling and auto mechanics. Just not a lot of experience in the new 2007 (ha ha) travel trailer technology.

I have seasonal camped for seventeen years. First camper was a 1970 BeeLine. I then bought a 1984 28' Fleetwood. But these campers were just towed twice a year.

So, I am a newby to having a "towable" camper. Trust me, it is a whole 'nother animal.

I'm back in the "Happy Camper" category for now. I have already upgraded the toilet, replaced a broken potable water drain valve. Next, install back-up camera and solar panels.

I'm sure I will need to pick your brains again.

Thanks fella's you guys came thru in a big way and in a hurry!!!!!!
DrewE
Explorer II
May 03, 2015
I'm glad it was all resolved easily.

By the way, some converters hum by nature. It doesn't necessarily mean anything is wrong—it's just the nature of the converter. Simpler ones have a big honking 120V to 12V transformer, and if something is slightly loose internally or if the stars are misaligned or whatever it hums.

More modern ones are switching power supplies, and these don't hum as such.

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