what are the things that could go wrong with a vauxhall combo alternator if it does not charge the battery,

GaryH, February 2010

hi there. have all fitted and ready to go but major slack in the belt. have you any diagram of correct belt assembly

noel cullen, March 2013

Brushes worn down, blown diodes, regulator faulty. IMHO the pulley is too big and gives no charge at idle. A friend is having a lot of grief with his even after paying £150 for having a brand new alternator fitted. Just can't get the right staff anymore. Check all earths as charging via the exhaust pipe etc won't be too good.

Davey, April 2010

new battery fitted 6 weeks ago gone flat nothing left on dont use often yellow light car with spanner through it keeps coming on

john, March 2010

basically get a exchange/reconned unit 12 months of free hassle. why

brushes worn out, no charge.
regulator failure, under/over voltage.
diode failure low charging,leakage voltage.

wirecutterman, February 2010