When they start to get flaky, it's common to just disconnect the alarm brain box. I don't know where it is in a 560SL. Probably against the firewall in the passenger footwell. My guess is that the alarm switch in the driver side door handle is bad. It usually means you need a new door handle assembly. Conjecture at this point.
Sixto
95 S420
91 300SE
87 300SDL
83 300SD
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