1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 27Get this manual
Ignition Troubleshooting DANGERHIGH VOLTAGESHOCK HAZARD! Do not touch ignition components andor metal test probes while engine is running andor being "cranked"STAY CLEAR OF SPARK PLUG LEADSTo assure personal safety, each individual spark plug lead should be grounded to enginetesting or servicing the ignition system, high voltage is presentDO NOT TOUCH OR DISCONNECT any ignition parts while engine is running
Tool: MultimeterDVA Tester 91-99750A1
Component Test Coil Primary Stator Charge Coil (COl) Unit Stop Circuit Selector SwPosition 400 DVA 400 DVA 20 OVA OVA Lead Red Coil (-) Black (B) Lead (2) Brown (Br) Lead (COl) Unit White (W) Lead
OVA Lead Black Coil (+) Orange (0) Lead (2) Ground Ground
Voltage Reading(1) 300-3000 RPM 160280 160280 3-7
If using meter that requires OVA adapter, place selector switch to the 400 VDC position Reverse Polarity (1) Readings may vary at cranking speed or at idle speed(2) Back probe the electrical lead bullet connector in order to make connection