1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 82Get this manual
KeyChoke Switch Continuity Test (COMMANDER 2000 Side Mount Remote Control) BLK PUR RED YEL BLACK PURPLE RED YELLOW
"OFF" BLKYEL BLK "RUN" RED PUR "START" RED PUR YELRED PUSH (CHOKE) RED YELBLK Key switch must be positioned to "RUN" or "START" and key pushed in to actuate choke, for this continuity test