Johnny,
Do you have any idea what causes the alarm to go off? I had a similar problem on my SDL after having a AM/FM/CD player installed. The car was just fine for a while, and all of a sudden, the alarm would go off. I carried it back to the people that installed the radio, and they fixed it, apparently, a problem with the wiring. Hope this helps.

Ken Yancey

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1987 300SDL
1990 300E
1989 300E
1986 300E
1981 300D
1983 240D