@Handymans342 I believe I am answering your question correctly, I have twin engines and 4 bank batteries. This maybe helpful an understanding my skill level with this type of installation with this question, If a isolator was in place before, shouldn't the wiring be there waiting to be connected?
No, those were the closest I could find to our 4 battery set ups. But it really should be the same for 4 batteries as the house batteries are paralleled together as one.
Looks to me those are the wires from the alternator.I bet the others are in the black plastic housing.Put a volt meter no them start motor and they should jump to 13.7ish.if you already winterized do a continuity from wire to alt.The other 3 should be close?
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Dream 'Inn III -- 2008 400 Express