This is my second post regarding this problem.

I have a 1989 300E that is doing something that no MB Tech, Indy Tech, or standard Mech has heard of before.

My MB runs fairly well. All in all it is a sound car and I have fallen in love with it since I purchased it 2 years ago. The problem appears when I turn the car off (completely). This is when the "Check Engine" light comes on usually 2 to 3 minutes later. The strange part to this is when I turn the car back on the check engine light will go out in about a minute and stay out for the duration of my trip.

I originally thought this was a result of the new altenator installed in my car a day before all this began. I took it back to the Firestone that installed it and they ran a diagnostic on the battery, starter, and altenator. The results came back with everything operating within their normal ranges with the exception of the battery which was a little low on CCA's (about 443, s/b 700). The mech there suggested that it was a problem with the car's computer which I disagree with because if this was the case the check engine light would stay on regardless if the car is on or off.

I then began checking under the hood for any loose wires or cables and if there were any faulty or exposed wires. Nothing that I could see with my eyes. I then began pulling the fuses one at a time in an attempt to isolate a fuse that may be the culprit. fter going through all the fuses the light never went out.

I am at my wits end with this because I am draining my battery everytime I turn my car off (Imagine that).

I would like to thank everyone in advance for any and all feedback in regards to this problem.