Quote:
Originally Posted by BWhitmore
Has the cluster been removed lately? If yes, is there a possibility that the bulbs for the brake pad warning light and the charging light were switched when plugged back in ? It is possible for the cluster to have a bad ground which is fixed by attaching a new ground wire (brown) from the back of the cluster to the steering column support where the other brown ground wires are attached.
|
No it has not been removed. Even if it was and they were switched, the alternator charging light should only ever be on when starting the car and then go out. The charging system works fine.
I’m sure the cluster could use an extra ground. I’ve not seen a w123 car that hasn’t benefitted. That said, the rationale why an extra ground, when the function of the brake light is to turn on when the circuit is shorted to ground, is foreign to me. Since the wiring harness and sensors are all in tact and operating fine, how another ground would improve it, unless there’s some other stray current in the cluster that needs to get directed to ground, is not clear.
There is a metal part of the brake wear sensor harness, which is supposed to be touching the mounting point on the caliper. I haven’t tested but think that’s electrically continuous to the light circuit. The connection just needs to be made via the sensor. So for the light to be coming on, some ground path needs to be intermittently being made, as I think voltage from fuse 10 is continuously there to the sensors.