Lights wont switch off

I had this on my '86 9000 a while back, If I remember correctly it was the column switch for the beams. I replaced it with one from a boneyard and all was well.

I diagnosed it with a voltmeter and a good wiring diagram and concluded that the column switch was bad. My brain is fuzzy on this one since it was probably 10 or so years ago that I fixed this one.

Bad earth (chassis) wire problem.

I once had the low-beam operation when braking. That was traced to an earth wire. Today, the sprinkler was going constantly while running the wipers, hence the water reservoir emptied fast. It was raining so I needed the wipers, I then unplugged the fuse for the headlamp washers, it seemed to fix it, but not really a long term solution.

It could involve a switch or ground fault but the first thing I would check is the headlight relay; the large red double one. The next time the lights don't go out open the relay box and give the relay a rap with a screw diver handle or some such. If the lights go out it is definitly the relay. If not. it still could be the relay but you would have to test by substitution.

Good hunting.

Hi, R. Frist,

Thank a lot. That was exactly it :-) A small tap with my keyring on the relay did the trick.

Regards

Flemming

"R. Frist" skrev i en meddelelse news: snipped-for-privacy@e56g2000cwe.googlegroups.com...

This happened on my first C900 (front light low beams only), and on my second one, the relay had been replaced by the last owner.