is there an easy way to test the coil on a 190e?
Also should you be able to see metal on the contacts of the distributor cap or is it normal to have a little carbon so that the metal can't be seen?

I do not know what you are talking about on the metal contacts, but all should be shiny and clean. IF it is the original one and you are in doubt, you can't go wrong with replacing it. You may want a new coil wire if yours is damaged.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

There is a real simple way to test the coil, but it may produce shocking results. remove the coil wire from center connector of distributor cap, from here you can go in a couple of directions. First is the safe way. Get a high voltage test lamp, put in series with the HV conductor, ground the other end and crank the engine. If the coil is working, the neon lamp will flash. Mind you this is a qualitative test only. It will not tell you the actual output voltage. (need a 'scope for that). The other way is the old fashioned back yard mech method. Follow above steps, but substitute your hand for the test light. If you get a wicked jolt, the coil is OK. (Just kidding!!)The only time you should get a shock from the HV side of the ignition is by accident. Never mess with it as above. Some of the high performance coils can produce really major voltage. Just get it checked at a shop with a 'scope... ;) ;) ;)


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Jeff L
1987 300e
1989 300e

sorry if this seems elementary, but how'd you get those ignition wires/coil wire off the distributor cap? Screwed on or just yank out? tks.

You have to turn and pull. They have a snap connection that does require some pursuasion to get off.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM