Please Explain Battery Isolator Operation/Function

[Tom Warner]

There are 3 terminals on your isolator. The center goes to your
alternator and charger, one end terminal goes to your chassis battery
and the other end terminal goes to generator battery.

The auxillary switch on the dash connects the chassis batteries and
generator batteries in parallel so that either the low chassis
batteries will be "boosted" by the generator battery or if the
generator battery is low, the chassis battery can "boost" it.

In the configuration you noted the charger is charging both the
chassis and generator batteries. But there really isnt a problem
since each battery is "isolated" from the other.

Is this what you were looking for?

Tom Warner
1982 FC35
Vernon center,NY


At 07:20 PM 11/6/2005, you wrote:
>My coach has 4 - 6 volt AGM batteries that serve as starting and
>accessory DC supply. I have
>a gel battery mounted in the generator compartment that starts the
>generator. I have an
>"isolator" in the coach battery compartment with leads coming from
>the coach and generator
>batteries. I use a Xantrex 40 Truecharge, located in the center
>driver's side compartment, to
>keep the coach batteries charged. On the dash I have a rocker switch
>that reads "auxiliary
>battery". My understanding of the dash switch is you can use it
>momentarily to augment the
>coach batteries if they're too low to get the engine started.
>
>I've read a number of references to isolators but am clueless on how
>they function and would
>appreciate some education on the subject. I'm particularly curious
>if my Xantrex charger may
>be supplying the generator battery as well as the coach batteries.
>Xantrex says mixing battery
>types with the same charger is not a good thing.
>
>Eric Johnson
>84FC35SB
>San Antonio Texas
>
>
>
>
>
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