Hi guys,
I've got an issue with my M20B25 in my BMW E21 not charging the battery.
I've checked the earths and they seem alright, although the main engine earth could do with being stronger perhaps.
Anyway, I tested the alternator with the engine running.
11.1v at the back of the alternator, same at the battery.
Then when we opened the throttle, the volts didn't change.
From what I've read the alternator should be producing between 14 and 14.5v.
Does this mean new alternator or could it just be the voltage regulator?
Dodgy Alternator?
Moderator: martauto
-
baur320
- E30 Zone Squatter
- Posts: 1507
- Joined: Wed Jan 12, 2005 11:00 pm
- Location: Tyneside
Hi Eddie,
I had a couple of random flat batteries earlier this year, but the last one was while driving and the car needed recovering.
The advice was to change the voltage regulator, which can be done without removing the alternator from the car. Got one of ebay for about £10 and its been fine since.
I had a couple of random flat batteries earlier this year, but the last one was while driving and the car needed recovering.
The advice was to change the voltage regulator, which can be done without removing the alternator from the car. Got one of ebay for about £10 and its been fine since.
Current E30 325i, E63 630is.
Previous E21 320/4, E9 3.0 CSA, E12 525, E30 320i, E28 528i, E34 535is, E30 318i, E28 525e, E30 325i Touring, E30 Baur 327i, E36 M3 Evo, X3is, E39 530d M Sport.
Previous E21 320/4, E9 3.0 CSA, E12 525, E30 320i, E28 528i, E34 535is, E30 318i, E28 525e, E30 325i Touring, E30 Baur 327i, E36 M3 Evo, X3is, E39 530d M Sport.