31-03-2014, 06:09 PM
if get out of the car and you leave your headlights on (going into shop ?) , when you get back in to start the car the alternator will indeed see the bulbs off to meet their maker in the glass skies.......
alternator sees voltage drop of the bulbs, you crank the engine over which takes a bit more from the battery, as soon as engine starts the alternator kicks in immediately to replenish battery=voltage spike to what ever is switched on (headlamp bulbs) and they pop.
or get alternator off, sent to be tested for max voltage/current output; I renewed an alternator on a td astra that had its engine management light on-----------at high revs it would suddenly push out about 18v @ 70amps....seen off a battery (boiled it dry) and kept management light on as ecu was about to sh*t itself !!!!!
alternator sees voltage drop of the bulbs, you crank the engine over which takes a bit more from the battery, as soon as engine starts the alternator kicks in immediately to replenish battery=voltage spike to what ever is switched on (headlamp bulbs) and they pop.
or get alternator off, sent to be tested for max voltage/current output; I renewed an alternator on a td astra that had its engine management light on-----------at high revs it would suddenly push out about 18v @ 70amps....seen off a battery (boiled it dry) and kept management light on as ecu was about to sh*t itself !!!!!