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BMC (Bluebird Motor Coach Unique Issues) If you have a unique issue with your BMC coach and it can't be answered in one of the other forums here, then this is where you can list it.....List your BMC Parts here too.

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Old 10-08-2019
jimmylee's Avatar
jimmylee jimmylee is offline
Junior Member
Join Date: Sep 2012
Location: Lake Mills
Posts: 19
Default Engine batteries

New to the BMC. Have 20 amp hooked up to keep batteries charged. House batteries are charged. Engine batteries are not. How do I keep both charged? Thanks!
Jim Shaykett
Lake Mills, IA
1978 FCRB-sold
1995 BMC 37

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Old 10-08-2019
DW SD DW SD is offline
Senior Member
Join Date: Jul 2010
Location: Encinitas
Posts: 1,734

Buy an automatic combiner relay. Check out blue sea systems for quality products.
Doug W.
Encinitas CA
2004 M380
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Old 10-08-2019
Harold,Cat&Sam Harold,Cat&Sam is offline
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Join Date: Oct 2014
Location: Mooringsport
Posts: 2,285

By 20 amp , are you referring to a battery charger or a shoreline ?

I chose to have separate chargers on each bank . By using two smart chargers/converters , they could monitor and charge each bank of batteries separately .

Alternator charged both banks through an isolator . A combiner relay would take the place of the isolator well . An isolator has a slight voltage drop , the relay doesn't .
Harold n Cat McMullen
Sam 11 year old min schnauzer
Mooringsport, Louisiana
1994 BMC 37' "Sold"
2004 Jeep Wrangler Unlimited
1986 F150
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Old 10-09-2019
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bwinter1946 bwinter1946 is offline
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Join Date: Mar 2009
Location: Madera
Posts: 4,398

Harold's answer is correct. However, there is another option that I sometimes use when I have full hook ups. There is a battery switch on your dash that combines the engine and house batteries. It can be used to assist your engine batteries if they are weak. I also use it to keep my engine batteries charged. Switch is a rocker style switch that is center off, momentary, and on. Switch label is: Aux Battery. Turn the switch on and your house batteries and engine batteries are combined. I leave the switch off unless I am charging the engine batteries as you could run down the engine batteries when dry camping.
Brad Winter
Madera, California
1997, 37' BMC
1999, Jeep Cherokee, Toad
1970, VW Baja Bug, Alternate Toad
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