Reply To: testing mercury 90hp trigger 828302a1

[billw]

CDMs actaully came out later than CDI or ADI, as Mercury called it. (Alternator-Driven Ignition.) When you say zero ohms, that means a short to me. Are you saying it’s shorted or an open circuit? I have seen some cases of triggers failing open because the wire broke inside the insulation and was intermittently touching. The trigger is moving back and forth all the time so the wire can fatigue. Try hooking the meter leads up with alligator clips so you can free your hands, then wiggle the wires around and watch the meter, to see if it jumps. Particularly the ground wire.

Long live American manufacturing!