Now, I bought the 85 300SD as my workhorse, and it has done its job well. My son, who laughs at my MB disease really gets a kick out it, when this problem surfaces: When I use my turn signal with the headlights on, and depress the brake pedal, the warning buzzer gives a half-hearted buzz, in sync with the turn signal blink, that according to my son "sounds like a mortally wounded small bird."

The Jersey Car, as it is known around the house will keep this peculiarity for its' life with me, as all cars have a personality, and certainly it deserves to be nurtured, and I can live with it and matter of fact I've come to get used to the wounded bird.

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71 220D 169K wrecked
83 240D 118K sweet 4 speed
91 350SDL (one of the 60% good engines) 156K
84 300d (loaner to my sister) 189K
79 300SD (partswagen)
86 420SEL partswagen
70 220d (partswagen)
68 280s GASSER!!! under construction now
85 300sd 310K miles winter beater car retired
93 300d 2.5 turbo 168K wife's car
83 280SL euro 5 speed 155K
69 250S newest project 54K

Usually electrical "Feedback" is caused by a poor ground somewhere.

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.

I agree with motorhead. Look at the taillamps when pressing the brake, you will probably find that several bulbs glow dimly. Check/repair the ground to that taillamp.

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Gone to the dark side

- Jeff

Could it be in the turn signal? I have had that happen.

That problem reminds me of a problem of one I solved on a A4 Audi. almost same symptoms and it turned out to be loose electrical plugs on the signal light switch. Loose connections anywhere in the circuit have the potential to do this.

In my car, I've found that a somewhat persistent loose connection in my rear turn signal bulb socket.
I open the bulb holder/sockets thing, wiggle the bulb around, and it's good for a while. I really need to get in there with a small wire brush and some dielectric paste though.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...