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Old 06-07-2004, 05:54 PM
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Join Date: Sep 2003
Location: Washington
Posts: 83
Lightbulb 300E Alarm Wire to the HU

During my recent install of my new Blaupunkt head unit, I learned something about the alarm wire from the old Becker unit. On my car (91 300E), the wire has to be connected to a ground in order for the alarm to function. Without it connected, the alarm goes off whenever I try to lock the door.

Luckily, on my Blaupunkt, the case has a tab that can be bent out on the rear of it, making a male spade connector. The stock alarm connector (female spade) fits right on this and will function just like it did with the other radio, disconnecting when the radio is pulled out and setting off the alarm if the system is armed.

In other posts, people have written that you don't need to connect this wire....which leads me to two possibilities: A. The people who wrote this don't have functioning alarms, or B. The alarm system has changed over different model years. In the factory service manual CD, there is practically no information at all about the alarm system.

Thanks
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