testing mercury 90hp trigger 828302a1

[Beno]

I seem to have no/intermittent spark on this new 90hp mercury force. this unit uses the Pre-CDI setup (no cdi boxes!)
best I can figgure the trigger acts something like point and the coils act like the computer module reading the trigger like a sensor.

to Test I;
Trigger Black function as a ground.
Disconnect trigger leads from switch box.
red ohm meter lead to brown trigger wire and meter black lead to black.
should read 1100 to 1400 ohms. repeat for #’s 2 and 3

Results:
ZERO ohms in any direction on the trigger, none to black/ground from any wire, and no ohms from any one colored wire to any other!!!

Seems incredibly unlikely that all 3 trigger circuits failed at once?

Ground wire seem to be in good shape.

Anyone ever seen this before?!

 

[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!

[Beno]

Sorry  infinite ohms.. as in No continuity at all… I tried the wire wiggle. Nothing.

The. I got some sharp pins and pushed thru the insulation as far up as I could go towards the trigger housing and still didn’t get any reading or any continuity.

I can’t see how all 3 sensor circuits went bad!

 

[Author]

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