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5,674 Posts
We should be looking at alternator. But also cheaping out on a diesel battery is asking for trouble
 

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2010 V6 3.0 litre
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Having a smaller battery... that happened to me, based on an error in the database for the local car parts store here in Australia (Repco) for my 2010 v6 CASA Touareg. That error got automatically populated in their system from somewhere else.

I went through two of the smaller (incorrect) batteries over two years and much wasted time trying to work out why starting was unreliable until I took it to an autoelectrician. They immediately found it was the wrong battery being used via their autoelectrican battery database (no hands laid on the car); I had far less cranking amps than required, and that was the problem with my smaller battery.

A new correct battery, and a refund from the parts store, has fixed all of my battery anbd starting problems.
 
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