Ok this is a weird one. The "idiot light" on the dash is lighting up saying that I have a bad bulb but only when the fog lights are on. On occasion the dash light goes out for a few seconds but will come on again especially if I speed up on the highway. However I noticed that I can actually make it go out if I turn on something that draws a lot of power (The rear defroster for example) It gets stranger still, on a rare occasion the dash light will blink in sequence with either indicator and will also go out if I turn on my highbeams (Sometimes is stays on though) Am I looking at a bad fuse, ground or the dreaded "Other" catagory?


(And before anyone asks, the fogs are less then a year old and work perfectly and the main H4's are less then 6 months old)

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

Sounds like an overall grounding problem. I'd check the battery connections, chassis connections, etc.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

Check ALL of your bulbs. Sounds like you may have a loose connection somewhere.

Don't forget about the little ones on the sides of the Tail lights on a W126.

BTW, your car is gorgeous.

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91 350SD
14 F150 Eco
19 Fusion Hybrid
11 GT500

maybe a stupid ?, but Have you actually looked at the fogs when the light says you have a bulb out? maybe theres a bad ground, and you really do have a light out.

I know the bulb failure relay's in our volvo are a common failure item, too.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

x2 Classic symptoms of a bad ground.

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Ken

1990 350SDL (It's a work in progress) 250K mi
1991 350SDL that was SUPPOSED to be a parts car 323K mi
2000 F350 Powerstroke 180K mi, 100K mi on B20 - B99
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Gone but not forgotten
1982 300D
1991 Jetta ECO Diesel