Anybody here have any ideas about this....

Whenever I plug in the alarm it drains my battery and makes a screeching noise from under the passenger carpet where the plugs are.

Any ideas on how to fix this or tests to find out what's wrong? I don't know anything about the alarm system in the w124.

I'd like to have the alarm functional again if possible as I have to park the car on the side of the street now as the apartment complex issued me a warning because of my oil pan leaks. (gonna fix that over new years)

Thanks!

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k