Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 29Get this manual
SHIFT INTERRUPT SWITCH
If high effort is required to shift outboard into NEUTRAL, or
outboard quits running when shifting into NEUTRAL, or there is weak spark or no spark on cylinders 2,4,6; test diode as foll ows: abDisconnect BLKYEL female connector from switch Insert one ohm meter test lead into female connector and second test lead into PIN of engine harness connectorObserve meter reading Reverse test leads and observe meter
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aShift Interrupt Switch
A shift interrupt switch is mounted below the shift cable on