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SANDDOG, you may have a battery system isolator already on your rig.
There are different looking ones, made by different mfr's.
The isolator relay is supposed to keep coach & chassis batteries from being connected to cause a power drain, and at the same time monitor both systems while a charge source is present on either side, and determine if it should let charging volts over to the other side (coach or chassis)
There has been lots of discussion on this forum on that topic already.
I guess what I really want to say is, make sure you get a battery disconnect switch, if that is your goal.
Precision circuits makes the one in the picture halfprice posted on post #3.
Note that one is a BIM in the nomenclature, it is a Battery Isolation Manager.
The same company makes one that looks similar, instead has BD in the name, stands for Battery Disconnect.
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Rusty
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