This was the solution the prior owner used on my 124.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes

Thanks Robert. But I'm ahead of you. I disconnected the horn yesterday. My car is parked closer to the neighbors' bedrooms than my bedroom, so it's high priority I don't disturb my neighbors.

George, the alarm is easier to disconnect on your model. Like M.B.Doc said, the starter interlock relay must be jumpered if the alarm is disconnected on my model. I'll have to get the schematics out and find which wire needs to be jumpered.

The ATA diagnostic faults on other models actually point to which switch (or circuit) activated the alarm. On my model I have to guess.

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95 E320 Cabriolet, 169K

Terminal 1 and 3 have to be jumpered at K-38 in order to disconnect ATA
and still have starter function..