1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 83Get this manual
CHARGING AND STARTING SYSTEM
COMMANDER 2000 Key Switch Test
1Disconnect remote control wiring harness and instrument panel connector2Set ohmmeter on scale for the following tests:
KEY POSITION OFF
CONTINUITY SHOULD BE INDICATED AT THE FOLLOWING POINTS: BLK BLKYEL RED YELRED PUR YELBLK