Also, the previous install had an isolator so it is conceivable that they wired the positive to the alternator post of the isolator. That way they could have charged both start & house batteries. If they wired to the start batteries, it would have only charged the start batteries.
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-greg
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"Goldilocks" 2020 Ford Transit High Roof Extended 3.5 EcoBoost AWD Homebuilt
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