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Old 08-30-2008
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A 30-year old battery switch may not be making proper contact anymore, the contacts do wear and sometimes shift. I'd be tempted to replace it, or to install a battery combiner switch (West/Yadina or Hellroaring) which starts you on the starting battery, then combines both to charge/run once the alternator has come up to full voltage in a minute or two. When you shut the engine, it disconnects them again, so your starting battery is just isolated for starting use while you are on the house bank.
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