Probably the brake light switch, need to check faults and actual values to confirm.

The fuses for lights (except maybe stop lights) are in the fuse box behind the light switch in the door ja accesible with the door open by a removable cover that form a portion of the end of the dash.

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