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Vauxhall Vectra C - Electrical fault - Boby

Have had a intermittent electrical problem for many months now, all dial needles bounce up and down battery/steering light comes on most warning lights on dash flash and on occasion can loose power steering. If I stop and turn of ignition when this fault is occurring can have problems restarting, car totally dead but will eventually start after many attempts. Have had into Vauxhall on several occasions but unable to diagnose fault as it is usually not there when I take car in. Have had battery checked its ok.
Loss of steering is now a bit concerning, any ideas ?

Vauxhall Vectra C - Electrical fault - Peter.N.

Carefully check and clean your battery connections, if that doesn't help it could be a faulty alternator. If you have a meter, connect it to your cigar lighter so you can see it when you are driving and check the voltage, you shouls have about 14.4v in normal driving, watch it when the fault occurs, if the voltage drops much below this you have a charging fault.