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  #1  
Old 05-09-2009
thudpilot1 thudpilot1 is offline
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Exclamation Batteries overcharging in 95 BMC 37

LAst 5 miles of trip leg, after putting on headlights as per Nevada law, both engine and coach meters rn to 16 volts. Caontacted a diesel expert who suggested it was probably a bad battery cell causing the alternator to overcharge. CHanged engine batteries and then found a bad cell in one of the 4 house batteries. Removed the bad battery and the meters still peg at 16 volts or a hair less. I'm in Beatty, Nevada and need a genius idea.
Thanks
Ed Nowokunski
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  #2  
Old 05-09-2009
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rwoody rwoody is offline
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lost the wire that tells the alt to quit or the alt regulator quit

get a alt chked or how far do you need to go tonite?

take off main wire off alt and drive off bat and gen set to get to location for the nite..

been there and done that
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  #3  
Old 05-10-2009
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Ed,

Does the voltmeter still read 16 volts if you turn the headlights off?

Have you verified the voltage reading at the batteries with a hand held voltmeter?

If everything reads 16 volts and you want to drive I think you can disconnect the alternator wiring and drive with the genny charging the batteries. Be sure to tape up the bare wires to isolate the alternator wires so they cannot ground out or touch anything.

I personnally have never seen a battery failure cause a 16 volt output from the alternator. I would suspect a bad connection at the alternator or a bad alternator voltage regulator.

This advice is worth what you paid for it.

Good luck.
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Last edited by bwinter1946; 05-10-2009 at 12:01 PM. Reason: Sp
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Old 05-10-2009
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i agree with woody and brad.
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  #5  
Old 05-10-2009
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My FC did the 16 volt thing, changed the regulator, no good. All batteries new. Problem was a bad ground to house bank, took a while to find.
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Old 05-10-2009
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Mike,a good pair of jumper cables could help find that,right?
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  #7  
Old 05-10-2009
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Quote:
Originally Posted by Randy Dupree View Post
Mike,a good pair of jumper cables could help find that,right?
That's right, but he problem was tracing the cable to it's attachment point, which proved to be @ the **** engine battery frame. ***. It was pretty well hidden.
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  #8  
Old 05-10-2009
thudpilot1 thudpilot1 is offline
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Thanks for input. I am at a CG plugged into 50 amps so ok for now. the diesel guy will pick up new alt today - believes that problem is that the regulator portion of the alt has gone berserk. I'll print out the all suggestions and discuss with him if it doesn't solve it. Beatty, Nevada is in the middle of NOWHERE - but has a casino about which the local world revolves - along with Death Valley.
Ed
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Old 05-10-2009
thudpilot1 thudpilot1 is offline
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Looks like we'll live happily every after - found a guy in Beatty thru a store owner who has worked on BBirds and is on call service for Peterbuilt trucks. HE analyzed quickly and replaced alternator which he had in his shop - a wealth of knowledge and I sucked his brain dry with lotsa good hints. I believe we have a good service section and I'll post his name, etc. All readings look good and we're outta here in AM.
ED Nowokunski
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  #10  
Old 05-10-2009
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Good news, Ed!

I am curious........

How much is an alternator for a BMC if you don't mind answering?

Happy trails!!
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