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Old 03-06-2012, 03:29 PM   #1
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We just aquired (last fall) a 1989 GMC Topkick with a 12' Aero Lite conversion. It lives in a garage and we have been pulling it out every 3 or 4 weeks, letting it run and driving around the section a few times. Last time when we put it back in the garage we opened the battery bay to hook up a trickel charger and noticed that the battery for the on board Ownan generator was smoking. We removed the smoking battery and noted that the battery cables and terminals were not excessivly warm. The battery is a sealed conventional 12v. DC automotive type battery.

Two questions 1) what would cause the battery to smoke other than a direct short to ground? and 2) are most generator batteries charged by the truck when running or by the generator set itself? Our generator battery has a + cable thru an automatic re-set circuit breaker to the parallell connected truck batteries +, is that normal?

New to this so any advice would be appreciated.
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Old 03-06-2012, 09:37 PM   #2
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Wow, that's scary a smoking battery. My truck batteries start the generator and when the generator is running it will charge back those truck batteries that started it. Mine is an Onan diesel unit. I'm pretty sure most of them do that. I'd suspect a failure in the battery since I doubt if anything was changed in the wiring lately. Can you take the battery to a store and have them hook up their tester and see how it looks to them?
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Old 03-06-2012, 10:05 PM   #3
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Let us know what you find out.
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Old 03-07-2012, 07:46 AM   #4
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was it SMOKE (from where) or misting battery acid (neither is good).
even SEALED (lead acid) batt's can be checked for fluid.

i would IMMEDIATELY pull that battery and test it, and check to see if its been "boiled" dry by the charger.

i NEVER EVER use a trickle charger - they will over charge a battery and boil it dry....
the internal chargers in most coaches are trickle chargers and need monitoring of the batteries to make certain they do not boil the batteries dry.

when i park our coach i disconnect the batteries and connect an INTELLIGENT battery maintainer (battery tender or battery minder) - intelligent chargers will adjust their charge output based on the batteries condition (lowering the change when the batter is "topped off").
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Old 03-07-2012, 09:11 AM   #5
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Good call, Don (bushpilot). I forgot about that one. My first camper, an Allegro class A, had an old fashioned charger converter in it. No circuitry to monitor anything. Huge thing that looked like you could probably weld with it. That first winter I kept it plugged in all winter and dried up 4 golf cart 6v batteries. Took it out and put in a expensive one that wouldn't overcharge them.
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Old 03-07-2012, 09:15 AM   #6
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yup sounds like the same pos that is built in, in our coach.
if im in "camp" connected to shore power i disconnect the batteries (by switch).

in my storage bay, even w/ shore power, i disconnect the batteries and keep 'em on "smart" chargers

im a huge fan of intelligent chargers....

ive got a few motorcycles that are on intelligent / smart chargers....sometimes years go by w/out starting 'em...and they always start right up...

I even use one on my f350....i managed to get 7.5 years out of the OE factory batteries as a result.
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Old 03-07-2012, 07:37 PM   #7
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Quote:
Originally Posted by bushpilot View Post
was it SMOKE (from where) or misting battery acid (neither is good).
even SEALED (lead acid) batt's can be checked for fluid.

i would IMMEDIATELY pull that battery and test it, and check to see if its been "boiled" dry by the charger.

i NEVER EVER use a trickle charger - they will over charge a battery and boil it dry....
the internal chargers in most coaches are trickle chargers and need monitoring of the batteries to make certain they do not boil the batteries dry.

when i park our coach i disconnect the batteries and connect an INTELLIGENT battery maintainer (battery tender or battery minder) - intelligent chargers will adjust their charge output based on the batteries condition (lowering the change when the batter is "topped off").
Why don't you leave the batteries "hooked up" and have the INTELLIGENT battery maintainer permanently hooked to the batteries? When you camp or store the coach, the motor is shut off and alternator isn't trying to put a charge into the batteries. Then when you plug in shore power, the INTELLIGENCY battery maintainer goes to work. When you leave, you unplug shore power.

Unless I'm missing something (and that is quite possible), I can't see why you unhook the batteries. Thanks!
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Old 03-07-2012, 08:52 PM   #8
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My three guesses would be one, mice could of chewed on some wires and it shorts,or the alt charged the battery even though it was fully charged.3.would Be the battery shorted inside the case.Take it to a auto parts store and they will check it for free.
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Old 03-07-2012, 09:12 PM   #9
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Quote:
Originally Posted by #90-GTSC View Post
Why don't you leave the batteries "hooked up" and have the INTELLIGENT battery maintainer permanently hooked to the batteries? When you camp or store the coach, the motor is shut off and alternator isn't trying to put a charge into the batteries. Then when you plug in shore power, the INTELLIGENCY battery maintainer goes to work. When you leave, you unplug shore power.

Unless I'm missing something (and that is quite possible), I can't see why you unhook the batteries. Thanks!
1) because i trust NOTHING and batteries are expensive
2) i believe my ac to dc inverter charger MAY boil my batteries dry....even though i keep a close eye on my battery water level AND we use our coach mor e than most...at least once a month !

when we are on SHORE power our inverter TRICKLE charges the house batteries (not the engine batteries).....again i dont want to risk boiling our
9 batteries - when i can disconnect them (call me overly paranoid or ANAL) and INTELLIGENTLY charge them myself.
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Old 03-07-2012, 11:25 PM   #10
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I had a similar problem in my trailer. When I bought it the previous owner had wired it with an older Magnatec 45 amp charger/12v power supply. One week it decided to start putting out too much voltage, and overcharged and cooked my 2 nice new deep cycle batteries.

Shopped around, and Magnatec is now Parallax, and the equivalent unit is now a 7345. I looked into better things, but rewiring would have been a pain. So they have the 7345RU which is basically just the replacement "guts" for the unit, you just change that out and don't have to rewire the whole mess. Allegedly the newest, greatest, surge & spike free version of the unit. Worked OK for 1/2 a year, then started the same crap all over. Only cooked one battery this time.

Did not change the unit, it seems to be behaving for the most part at that point, but it has really quirky behavior. Seems to work just fine to stay plugged into 110v to keep the batteries charged for standby. During use when we are camping it sometimes does all sorts of strange things. Some days it works fine under any load. Other days if we are only running a few lights it will just let the battery drain until the lights are dim and the fridge shuts off from low voltage then we have to turn on all the lights to get it to start charging, but if we are using more power from the get go it will work just fine. Other days if we are using more lights it will jump back and forth between "normal" and overcharging, as the lights keep going from normal to way too bright and back. But most days it is good.

That is on shore power. If we use a generator, all bets are off and it does all sorts of weirdness, and some days it is tricky to get it to charge the batteries at all.

Any help out there on this similar problem?
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