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Then you have to have two switches or a dual switch.Mogman I think that’s the point lol……I want to cut everything off when I use the switch.
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If you break the connection between the batteries and leave the 12v connected to the high side battery (neg) you have the exact same situation you had when you disconnected the ground side of the low side battery the 24v stuff will seek ground through the 12v equipment, if you leave the 12v connected to the low side battery everything 12V will still have power.
No way around having a dual or two switches
BTW the feed you saw illuminating lights etc were because you were causing a reverse polarity on the 12V connections, this can cause damage to the 12V electronic equipment, the big hazard of just disconnecting the low side battery ground.
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