1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 23Get this manual
WARNING When testing or servicing the ignition system, high voltage is present, be extremely cautious! DO NOT TOUCH OR DISCONNECT any ignition parts while engine is running, while key switch is on, or while battery cables are connected
STATOR TEST
NOTE: Stator can be tested without removing from engine1Disconnect stator leads from switch box2Use an ohmmeter and perform the following testsIMPORTANT: If stator is mounted on engine, black stator lead must be grounded to powerhead when testing91824 AMPERE STATORS (3 CYLINDER)
Test Leads Between Blue Stator Lead and Red Stator Lead (Low Speed) Between Red Stator Lead and Engine Ground (Hi-Speed) Resistance (OHMS) 3600-4200 (90-140) 90-140 Scale Reading (x) 3.6-4.2 (R 1000) 90-140 (R 1)