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Old 07-08-2008
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You actually need that connection - as it provides the charging source for when you are motoring from the alternator. There are various ways to hook this up and the diagrams they give are reference only.

I run the alternator output to source input of DC to the house banks (on the selector switch), as the starter battery will get the topping off of the selector switch when in the on position. But you can also do it as in the diagram you have listed. Just means that the charging source goes through the ACR to get to the house batteries and starter battery gets it directly first.

But not tying in the alternator (which is the crossed out line you have) would prevent purpose of running the motor to top off the batteries and or run loads under power. Unless of course you have no alternator..then not needed...
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