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perhaps electrical system problem 1984 Mercedes-Benz 300 DT?

I seem to be having some kind of electrical problem with my car.

I hear a sort of clicking/shocking noise from near the firewall middle while inside the car; it sounds similar to a stun gun being discharged, and only occurs when I have the front defroster/main heater turned off. when i turn the defroster on, it goes away.

I have checked the battery cables and inspected the battery while the car is running, and i don't see any electrical discharge, and cannot hear it while outside the car.

occasionally while driving, the seat belt light will come on, and sometimes just before i start it up. the dashboard information lights will go off, while they usually stay on for about 5 seconds after the car is started. also, i occasionally get a little shock while closing the door after exiting the vehicle, suggesting that something is expelling electricity into the frame or something metallic connected to the frame.

i believe it may be associated with water damage to an electrical component; it started happening about a week ago after i degreased and power-washed my engine well (i accidentally left a half-empty bottle of oil open in the space behind the headlight after topping off all my fluids).

does anyone know what component may be damaged, or how to solve this problem?

I have never had any electrical problems (haven't had any problems with this car at all) before, and the problem seems to be either associated with and/or effecting the heat system.

2 Answers

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  • 1 decade ago
    Favorite Answer

    From the sounds of your problem there is a relay cycling in your heating/defrosting system when not in use. It is very hard to do electrical trouble shooting over the computer, my best advice is take it to the dealer and have it looked at, like i said it sounds like a relay and there only 10 or 20 bucks. I'm sorry i couldn't answer any farther, just too little information.

  • ?
    Lv 4
    4 years ago

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