Apologies for the late post on this topic. I have been out of town on business.

The culprit has been identified. M.B. Doc, you were so correct! It was the Over Voltage Relay. I am ashamed to say that I never realized those relays were back there in the battery well.

First I pulled the 10A fuse from the relay. As soon as I did that the CEL went out. After inspecting the fuse and seeing no breaks in the contacts. I decided to replace the fuse anyway. When I inserted the fuse back into the relay, the light came back on.

I then disconnected the relay and hit it against my hand about 10 times and re-attached the relay. The light came back on. I have the new relay on order and should be delivered in a few days.

I would like to take this time to thank everyone for their valuable information. It has proven invaluble.

Cost of 1989 300E - $2,500

Investment to get car road ready - $900

Engine & Tranny replacement from car being stolen - $3,700

Forum with tons of helpful information - PRICELESS!!!