My 1985 300CD's battery died. After several unsuccesful attempt's to recharge, I had it load tested, and I ended up replacing the battery. Ever since then, the tachometer quit working and the a/c compressor no longer comes on. Is this just a coincidence, or are they related somehow? ------------------ |
Related! Your car has an overload protection relay that protects the EGR computer from excessive voltage. The relay has a 10A fuse that blows when the voltage is to high or has incorrect polarity. The relay is mounted next to the right A/C outlet vent beside the glovebox.
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To add to DOC. You have to take out the inner panel of the glove box. The small rivets have to come out then just pull.
------------------ Benzmac: ASE CERTIFIED MASTER AUTO TECHNICIAN SERVICE MANAGER FOR 14 BAY FACILITY MERCEDES SPECIALIST 8 YRS PARTNER IN MERCEDESSHOP.COM |
The 1985 model also has an electronic EGR control unit.The tach signal runs through it.There is a wire at the positive battery terminal that supplies power to the EGR control box. Be sure that wire is tight...I've seen them loosened during a battery swap and not retightened.
Randy D. |
You guys are awesome!!! It took all of 15 minutes to replace the blown fuse on my relay and restore my tach and A/C. The A/C is particularly satisfying as the temperature has been 100 degrees for the past several days. Thanks again. |
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