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Old 06-25-2001, 12:41 PM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The 300SD would be a very different system than those described above. It DOES NOT use engine vacuum. It uses a bi-directional pump that sucks and blows. It uses a single air line to each element.

The pump is in the trunk with the spare tire. It is activated by only the drivers door (I think on an 83; later years worked from the pass door and trunk)

Actually I checked and there is one switch in the drivers door. It carries power from fuse 13 through either a blue wire for lock or a yellow wire for unlock. This should be monitored at the pump while someone works the lock at the door.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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