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Message: <blockquote data-quote="SicAudio" data-source="post: 5908925" data-attributes="member: 609136">yeah, I would have to partially agree on that,  sounds like the alt may be working overtime.  try this as a test:disconnect the run to the rear batts and test it at the front battery  see what you get.  if the voltage is less than with them connected  you have an issue with wiring or the batteries.  but if it is doing this without anything on  i would suspect the alternator itself.  extra batteries only take about 10 amps for a short period until they are charged, then they run off about 1 amp after that,  as long as they are not being used.I had 1 run of 2 guage ran to 4 hc1400 batteries and never got more than .1 volts difference from the front to the rear,with nothing going but the motor, so it is questionable,  and I only have a stock 135 amp alternator.</blockquote>

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