L&N Caravan

2002 E320 4matic wagon 110k, Alternator error light just came on. There has been a rhythmic grinding sound & feel coming from the alternator so i'm not surprised.

Needing information:
- 120 or 150 Amp?
- Any special notes to keep in mind when DIY?
- is this a DIY rebuild?
- If yes, where to buy the rebuild kit.
- If no, best place to buy a Bosch reman?
- what's a fair price to pay?
- should i be checking voltage regulator?
- with voltmeter, 15.6volts at battery while car running
- what's the proper voltage range when measured at battery while running in park with no accessories on? with accessories on?

Thank you,
Steve
Campbell, CA

Fabio D

15.6 is extreme high! dont run the car at this point my friend! you would burn some electrical components (like: cluster, a/c control) blower regulator, radio, etc) you have a bad voltage regulator! replace it & make sure you get voltage in 13.6 - 14.2 range no more than this.. check for a bad front/rear bearings in the alternator for the grinding sound

Fabio Daniel

L&N Caravan

Thank you Fabio. On this vehicle, is the voltage regulator a separate item from the alternator, or is it internal to it? Any recommendations where to buy a new one in your experience / postings?

Ciao, Stephen

Musikmann

The VR is a separate unit and that sounds like the problem to me too. Also agree with Fabio that 15.6 is too high, be careful.