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It all tested fine and I went for a decent drive, all good. I have noticed however that the isolator is staying in the on position now about an hour after my trip. I tested the batteries and found that the main battery is reading 12.8v and the aux is at 12.7v.
If the unit has a cut in at 13.4v and a cut out of 12.8v, with a margin of error could this be why the unit is still active. Even with the ignition off?