Another bulb failure light...but

[gorselands]

Bulb failure light remains on with side lights. No instrument lights, buzzer, o/s side lights, number plate lights. Checked all bulbs, contacts and under bonnet fuses, OK. Wiggled trip/rheostat to no avail. Any ideas? Coincides with rear screen replacement, filling up and resetting trip. Otherwise clueless.

Everything else working. Are these lights connected? Could the failure of an instrument light affect side lights etc?

Any help appreciated.

Mike
1993 220 ce 124 116K

 

[television]

Hello Mike

The instrument lights have nothing to do with any outside lamps and are controlled from the dimmer knob in the cluster.

Outside lamps could be poopr contacts in the sockets or broken wires. Wires do break on the hinges to the boot.


A volt meter is a safe way to find the problems without creating more

With the lamps turned on 12v on the cener contact means that there is a bad ground, 12v on the case part of the bulb confirms it

 

[gorselands]

Thanks for the quick reply and advice Malcolm. Are you suggesting two separate faults: rheostat and wiring? I will test for voltage but have to go out shortly.

Cheers

Mike

 

[television]

Maybe I did not write that too well from a fuse in the box the wires go from there to the light switch, and from the switch they go their seprerate ways.

If you have the single parking posistion, do the parking lamps work then.

When checking fuses always best to use a meter on the contacts and not on the fuse

 

[gorselands]

Hi Malcolm,

Parking lights work on the n/s but not on the o/s.

Can't fathom why dash and side lights should fail at the same time, must be off the same feed via the switch.

(Not tested the new rear screen yet and with the trouble I've had just wondering if that could be in the loop - pos going to earth/something disturbed when fitted. Though would think totally separate circuit.)

Thanks for your help. I have to go out again so will log on in the am.

Mike

 

[television]

The switches can go faulty and there have been a few of late

The screen demister gets its power from the N10 relay via a fuse in the fuse box

 

[gorselands]

Hi Malcolm.

Incidentally, front fogs work but only rear n/s fog (orange bulb ok). As you say, it looks like a faulty switch which is feeding power to some lights and not others. But when switched to sidelights/parking why does the n/s work and not the o/s - it's the same switch position, same with rear fog? Is there more electronic 'wizardry' associated with it than my simple mind envisages?

I would like to have a look at it but can't see how it removes. Is it a dashboard out job?

Rain stops play this morning so have spent a couple of hours looking for related info without much luck.

Thanks again

Mike

 

[gorselands]

Hi Malcolm,

What a fool I am. Eventualy realised that there are separate fuses for left and right sides. Went back to square one and re-tested. It turned out to be a bad contact on no. 3, cleaned with SOB and replaced fuse. Sorry to have wasted your time. Lesson: check the basics then check them again!

Mike

 

[television]

Thanks for posting back,,its working and that is the main thing.

Do clean all of your fuses with a good switch cleaner to preserve the life of the fuse boxes