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Answered in 1 hour by:
6/13/2015
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11,507
Experience: 40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
VerifiedHello Greg. The easiest way to see if you have lost spark is to start the engine then pull each plug wire off at the spark plug. The engine should drop rpms. If you find a misfire then swap that cylinder coil with a known good firing coil. Does the misfire move or stay. If it moves that coil is bad replace the coil. If it stays we have to do some testing with the ohm meter. Do these checks and post back with findings.
Here is the trigger test. The area circled in blus is the test you want to perform. If either of these fail the test that is the bad component. Now if both pass stator and trigger then you have a bad switch box. Mercury recommends replacing both boxes.There is no test for the switch box so we can only test inputs to the switch box.Post back if you need part number for any of these compnents. The switch box 778A1.
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