- GT V8 dual batteries - which is "primary"
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    1. 08-28-2019 10:35 AM #1
      I have large battery on left side of trunk, smaller on right.
      Last week, car would not start.
      Found left (larger) low on voltage, right was fine.
      When calling for replacement battery quotes, was told 'primary' is the right/smaller one; assume their system is wrong, since left was low, and likely causing the no start.

      a) which is the primary battery (left/right, large/small)?
      b) with (assumed) primary battery low/drained, by did secondary battery not 'jump in'?

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    3. Member robbie-rocket-pants's Avatar
      Join Date
      Mar 25th, 2012
      Lincolnshire, GB
      2011 Phaeton V6 3.0TDI , 1954 Austin A30 803cc
      12-08-2019 05:40 PM #2
      Left is main electronic systems battery (AGM).
      Right is just for engine starting.

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