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Battery Question


96 380 Santego

I have two systems a house set up with two AGM‘s and a cranking set up with two lead acid batteries. Both systems have the 2nd battery wired in parallel but system 1 is isolated from system 2 on the + side unless of course someone puts the battery switch in the BOTH position. HOWEVER ALL the negatives/ engine grounds are tied together.

My question: If my house system call it #2 is low at 9V and #1 system is good at 12.7 . Without hooking up any charger they will EQUALIZE… How does that happen?? Is it through the negative side of the circuit somehow?

Thanks so much for your wisdom I’m still learning.. should I separate the negative/ grounds for each system?

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