Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 57Get this manual
Quality of the image is intentionally reduced!
Ignition Troubleshooting (Continued) ToolMultimeterDVA Tester 91-99750A 1
' If using meter that requires OVA adapter, place selector switch to the 400 VDC position- Reverse Polarity (1) Readings