Lately on our '87 TD, when ever I turn on the lights, the faulty bulb light on the instrument panel illuminates. I checked all the lights and they are all working. Any ideas? It's real annoying driving around with a bright yellow indicator illuminating.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member

check the license plate lights, this gets overlooked, isolate the systems, does it only come on when you turn on the lights, press the brake pedal, do the entire walk around with someone turning on the lights, some of the parking lights use 2 stage lights and if one stage is out it will look dim but still light up and make you think it's ok. let us know what you find

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Jerry

2004 SL500 Black 55K Miles
2002 s500 Black 90K Miles
1986 300E Gold 233K Miles
1966 Twin Cessna 320D
1989 Jeep Cherokee 233K Miles
1994 Ford Van E150 399K Miles

Could be a bad connecton in the light socket or a bad ground. Pay close attention to the brightness of the bulbs or moisture in the lens. Do they all look the same(brightness)?
My TD had a burnt headlight connector that would sometimes give me a yellow dash light.

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82 Rabbit diesel (first d), 84 Jetta turbo d (300k when sold), 83 240d (305k when sold), 84 F250 6.9d w/Banks turbo(parts truck), 86 F250 6 cyl.gasser(waiting for 6.9d), 84 300d ( 347k Sold 8/04), Y2k New Bettle TDI (185k miles), 95 740IL (wifes), 87 300TD (206k Sold 7/05), 05 Passat TDI Wagon

I'll check the plates and check for equal brightness on the parking lights. The fault light comes on as soon as I turn on the parking lights. So that elliminates the brakes and headlights.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member

Hello,
According to my owner's manual, the warning light will also illuminate if a bulb is of incorrect wattage (to low).

Rob

Rick:

I have had the faulty bulb light come on because the relay base pins were not making good contact with the plug sockets and another time when my headlight bulbs did not match exactly (different watts).

Cary.