So I was in the car when it was off. I hit the break and the emergency brake light went off and the tach and fuel gauge dropped, the headlights are ultra dim and the windows won't operate? What happened? The fuses don't seem to be faulty? I was messing with the vacuum lines for the locking system right before it happened. I changed out a fuse to but it looks okay. Any ideas??? I can't drive at night like this....

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1984 300d....

The only thing I can think of it to check the voltage regulator. It's on the bottom of the alternator and only held on with 2 screws.

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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I take this to mean the engine was not running??

I take this to mean you hit the service brake and the brake light illuminated?? The fuel gauge dropped.........with the engine not running??


How did the headlights get turned on in a vehicle that is not running? The windows don't operate in a vehicle that has the key in the zero position.


From the information provided, I don't think anybody can possibly hazard a realistic guess..........

Actually I removed one fuse and that got everything working again. It wasn't the fuse operating that stuff though. I'll replace it tomorrow and I'm assuming all should be fine...

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1984 300d....

Yes, removing fuses definitely helps get things to work.........again..........

Wow....this is bizzare......things operating yet turning off with the car off....and lack of fuses making things work again. That car is either possessed or magic!

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Rename her Christine....

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92 300D 2.5L OM602 OBK #59

..........krystal.........

If the engine was off but the key was in the accessory or run position, the brake lights could have drawn enough current to affect the other electrical components, but that probably means you have a weak battery.

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now

The reason it sounds weird is because when I turn the key all the way on....the electronics start up but not the car. I have to touch a couple wires together to turn it on. That's how it was when I got the car so if you have an answer to that issue than I'm all ears....

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1984 300d....

Possibly a problem with the ignition switch?