battery light flashed on.

[S111 NSN]

Hi everyone,
I was giving my 2.5tdi a clear out yesterday and at around 4200 rpm in (3rd i think) the battery light, lite up for a split second.
Has anyone else had this? or does anyone know why this would happen?

 

[Mike.M]

Check the battery terminals and also the output of the alternator..........otherwise never had it happen to me

 

[swarcup]

Possibly the belt that drives the alternator maybe Slipped

 

[marktdisport]

Check the alternator pulley mine was nearly in 2 pieces lol....

 

[adamss24]

Check the alternator pulley mine was nearly in 2 pieces lol....

The v6 tdi has a solid pulley, does not have a one way clutch like the pd engine. I suspect the brushes are worn on your alternator or a diode is on it's way out. I strongly hope that your aux. belt tensioner is in good condition and the bushes are not worn, otherwise it's a front off job to repair. When the bushes wear trough (they are 1mm thick) the aluminium bracket wears very fast and requires a new cast bracket (doubles as PAS and A/C bracket) which is a pain to replace as it requires oil cooler removal- messy and tricky due to lack of room !
Easy to see if the bracket is worn, when the plastic damping cover/noise insulation is removed the belt running on the aux. tensioner will run close to the edge and cuts into the plastic/melting it ! TPS keeps parts in stock as it's a common failure...