Warning Lights
Moderator: martauto
Hello all. I took my car out this morning and three lights came on and stayed on - the battery light, the handbrake light and brake hydraulics light. It’s been raining here so could water have got in? This has never happened before.
- paultv
- E30 Zone Squatter
- Posts: 1541
- Joined: Mon Apr 21, 2014 11:00 pm
- Location: Auf dem Schnee: Germany
Check fuse 10 to start with
Paul
Paul

4th May 1990 325i Convertible.
BMW E30 Cabriolet Best Mod Ever:
https://bmwe30cabriolet-wdm.blogspot.com/
BMW E30 Cabriolet Best Mod Ever:
https://bmwe30cabriolet-wdm.blogspot.com/
- Brianmoooore
- E30 Zone Team Member
- Posts: 49353
- Joined: Mon Jan 10, 2005 11:00 pm
All those lights, except the battery light, are legally required to have a 'test' function every time the car is started. The test starts when the ignition is turned on and ends when the voltage on the blue wire from the alternator reaches a certain level. The battery light is also controlled by this same blue wire, so it looks likely the alternator is not producing the correct voltage on it.
The cause can be anything from a broken belt, through a poor earth for the alternator to worn out brushes in the regulator pack.
Move the air filter out of the way, unscrew the regulator pack from the back of the alternator, and check the brushes.
The cause can be anything from a broken belt, through a poor earth for the alternator to worn out brushes in the regulator pack.
Move the air filter out of the way, unscrew the regulator pack from the back of the alternator, and check the brushes.