Being a 93 the alarm could set the k38 relay. If so the car won't start with the alarm module disconnected. It would be this way in 94 I know and the 93 is like the 94 more than the earlier versions. I'd try it and if it won't start bypass the k38 relay.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician