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Alternator question 200

posted by  B.C. on  Tue Dec 5 07:26 CST 2006
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last visit: Wed Mar 28 22:28 CST 2012
[RELATED]

Unless the voltage across the battery is above 12 V, the alternator is not producing current at all, or at least not enough to charge the battery.

DO NOT disconnect a battery cable while the engine is running - some think that is a way to test the alternator, and maybe it is, but there's a chance that the resulting voltage spike can fry some expensive electronics.

It is the voltage in excess of 12 volts that charges the battery.

On a Volvo, I would suspect the brushes/voltage regulator unit. It is a single unit mounted on the rear of the alternator with two machine screwes. It is replaceable as a unit.

On a non-Volvo, it might be the same, have a look.

Good Luck,

Bob

:>)


PS: Do you have a tow strap? Having a 15-footer makes towing a dead car home quite simple, expecially since the Volvos have a towing loop front and rear. (Not on the rear is car has a trailer hitch.)






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New Alternator question [200]
posted by  TwoFortyWagon subscriber  on Mon Dec 4 12:23 CST 2006 >


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