S60R Alternator....

Re: S60R Alternator.... (jeane123)

As far as I remember your reading should be around 12V when engine is off and around 14V when engine is on. If you have current sensitive equipment turn it off before shutting off the engine.
I don't think that you need new battery/generator.

Re: S60R Alternator.... (jeane123)

My 2005 needed a new battery at 58K miles, and I believe it is a Nov 2004 build date. IMO, if your battery is 4+ years old, change it.

Once the car starts, I thought the battery had zero to do with anything else for the car, so the alternator takes over, electrically, once the engine is "on". You may very well have other issues.

actually the batterie holds the charge and explels voltage when the car is coasting sometimes or between shifitng .

If your batterie kicks the bucket while driving the car will eventually shut off.

Re: S60R Alternator.... (jeane123)


When it is "hot", are you running the a/c fan at full blast? That might cause a slight drop in voltage. Are you taxing the battery with an increased electrical load from all your add-on's? Otherwise, you should see about 13.8-14.2 volts all the time.

Re: S60R Alternator.... (jeane123)

Sound like your voltage regulator has gone bad.
There is an issue with voltage regulators that the Bosch part # ends in 229
When they get hot, they tend not to charge or not charge enough and kill the battery.
Bad thing is when tested cold, they will test just fine and thats usually what happens when they are towed in dead.
Good thing is the regulator is available separately and usually is the issue.