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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 07-04-2019
LeRoy LeRoy is offline
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Default Aux switch position and chassis bats

I have a paper in my blue box that sounds like if the gen is running or your plugged into shore power that you have to turn on the aux switch to charge the chassis bats. Otherwise you only charge the coach bats. I verified with a multimeter that it does seem to function that way. Has that been everyone else’s experience? If so I have been doing it wrong. I thought shore and gen power charged both banks and you only used the aux switch in emergencies.

So then that makes me wonder does the alternator only charge the chassis bats when driving if the aux switch is off?

WOG makes me smarter one day at a time. Thanks.
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1995 BMC 37 “MockingBird”
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Old 07-04-2019
turnkey turnkey is offline
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My bus works like that. The chassis batteries are connected to coach batteries only when the Aux battery switch is in the left position while on shore power or gen.
When the ignition switch is turned on it connects the two banks for charging from the alternator even if the switch is in the middle position or left position.
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  #3  
Old 07-04-2019
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jcs707 jcs707 is online now
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Quote:
Originally Posted by LeRoy View Post
I have a paper in my blue box that sounds like if the gen is running or your plugged into shore power that you have to turn on the aux switch to charge the chassis bats. Otherwise you only charge the coach bats. I verified with a multimeter that it does seem to function that way. Has that been everyone else’s experience? If so I have been doing it wrong. I thought shore and gen power charged both banks and you only used the aux switch in emergencies.

So then that makes me wonder does the alternator only charge the chassis bats when driving if the aux switch is off?

WOG makes me smarter one day at a time. Thanks.
Lots of good info here ... look at 'MODE-4' https://www.wanderlodgeownersgroup.c...ad.php?t=28929
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Clint & Tammy Summers
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Old 07-04-2019
dthollis dthollis is online now
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Our 1994 BMC as originally equipped did not charge the chassis batteries with the on board charger/converter. In fact, every 94 I've seen didn't even have an "AUX" switch to combine battery banks. A prior owner added a DC-DC battery maintainer that puts a trickle charge to the chassis batteries only when the coach batteries are above a certain voltage. Automatic and works well for us.

Our alternator charges both banks through a diode type isolator mounted in the electrical compartment. The alternator remote sense wire is connected to the chassis batteries.

1994 BMCs are often quite different than the 95-97s. Yours may be different but I'm pretty sure our setup is the way our BMC was originally equipped.
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  #5  
Old 07-04-2019
LeRoy LeRoy is offline
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Excellent information everyone thanks.
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Old 07-14-2019
Clembo Clembo is offline
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I think the factory set it up that way because start batteries and deep cycle batteries charge at different rates and the start batteries get overcharged or vise versa when they are charged together.
Dan
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