96 Model 25 Hp Mariner Manual
Remove the black/yellow wire from the switchbox(powerpack) that runs from the kill switch. This will eliminate the kill switches totally. If it fires then you will need to find out where the kill switch circuit is grounded. If that does not work, the next thing to check is the stator which is under the flywheel. It can be checked with a ohm meter. Remove the black/yellow wire that runs from under the flywheel to the switchbox and the black/white wire that runs from under the flywheel to the switchbox. Between the black/white and the engine ground the reading should be between 120 to 180 ohms.
Between the black yellow and engine ground the reading should be 3200 to 3800 ohms. Between the black/yellow and the black/white should be 3100 to 3700 ohms. If it is anything other than that, the stator is bad. If the stator reads good, then you need to test the trigger coil which is also located under the flywheel. Remove the brown and the brown/yellow wire from the switchbox. Between the brown and the yellow/brown should be 650 to 850 ohms.
Any other reading means the trigger is bad. That pretty much checks out your whole ignition system.
If the kill switch system is OK, I would guess that the stator is bad. I hope this helps. Former certified Mercury mechanic now selling rel estate.
40 Hp Mariner Manual
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Mariner 25 Hp Manual
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