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post #3 of Old 07-24-2011
JimsCAL
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Even with a make-before-break switch, you can fry the alternator diodes if you go through OFF. You do have to careful and think before you switch batteries with the engine running. Most batteries switches are of this type, but its best to check with a digital multimeter. Installation of a battery combiner is really the way to go as btrayfors suggests.
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