I NEED HELP!!!

I have a 1996 VW Jetta. I took off the negative cable on the battery while the car was running to diagnois if the altenator was bad. The car continued to run. I shut the car off, and now, everytime I try to re-connect the negative battery cable to the battery, the alarm goes off. I have been trying to get it back on with no luck for about 30 minutes; with the doors open, with them shut, etc. The neighbors are getting sick of it! I checked for a fuse just for the alarm, but it doesn't look like there is one.
Can someone help me?


[Modified by FlippedBMW, 7:14 PM 12-1-2001]