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Old 08-30-2008
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With just a basic battery switch, you want BOTH on when running the engine to keep both batteries up. I would be concerned that the switch may have issues if the electronics shuts down when switching batteries (I assume you are not going through OFF but through BOTH. Until I had that issue resolved, I would start the engine on BOTH, leave it there until stopping the engine, then shift to the house battery. That should prevent frying the diodes in the alternator.
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