MAS unit (perpendicular to the battery near fire wall) has round knob on top.While fishing for the overvoltage relay(on the other side)to check fuse,fiddle with the MAS knob to see if that hold the fuse.Knob has a dial,and arrows going in opp direction,and similar markings on top of control unit,I and O.What direction should the dial be pointing???
Many thanks.

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Tom 1992 300E 2.6

It should be in the clock wise position....I think/

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

Thanks Benzmac,
Do you mean turn the knob fully clockwise??

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Tom 1992 300E 2.6