My 1984 500SEL is having starting problems and from looking at a few of the posts here it appears it could be located in nthe ICM ot the coil. Is there a way to test the ignition control module or is it a replacement only option?

on that system you check the module for power, ground, & trigger signal from distributor to the module. If that checks out then the module is at fault!

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MERCEDES Benz Master Guild Technician (6 TIMES)
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The power and ground would seem to be rather easy to accomplish. How do you check for trigger signal? With a multimeter?

The "green" lead for the distributor must generate a small A/C voltage durning crank. a few tenths of a volt A/C should be enough.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thank you M.B.Doc.

I wanted to shorten that to just Doc, but didn't want to offend.

hard to affend an old guy.. doc is fine

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

I unplugged the green lead from the distributor, but noticed it has a outer and inner contact. Do I connect between the wire and the ICM or between the wire internals?

I purchased a repair manual and have located the section on testing the ignition system. I believe this will give me my answers.

Thanks again Doc for the help.