Just a note to thank forum members Ed Mahoney and onehundred80 for your help with the siren alarm that chirps.
It arrived today. I installed it today. And it chirps!


I now know for a fact that MB part# A219 620 3226 does chirp.


One chirp to lock and three to unlock.


Wheee !


Oh, by the way - this new siren had a metric stud on the back . My old siren had a screw that you needed to install from the engine side of the firewall into the siren which was on the other side. Just fussy trying to line everything lined up while bent over the fender. The stud is much easier.
Again, "Thanks" guys.
Pete