MarineEngineForumUser
New member
Hi All,
Assisting friend who lives two hours away in diagnosing a no spark on #3. #1 and #2 fire and run fine. #3 no spark, but sparks fine when wire from CDI to #2 is swapped to #3.
Don't have manual, but wiring diagram shows pulser coil signals CDI for #1 and #3 and CKP signals CDI for #2. Have provided basic resistance checking info to him for the w/r and w/b from the pulser, and bl/w and bl/r from the CKP. He has not yet traced every wire back to the flywheel, but is taking apart in next day or so. Is the CKP also inside the flywheel, or is it mounted lower down on the casing?
I'm still trying to get my head around how only one pickup coil on the flywheel can provide firing input to two cylinders that are 240° apart in firing ... or does this not matter as long as the + and - are sensed and the CDI does the math?
Thanks!
Assisting friend who lives two hours away in diagnosing a no spark on #3. #1 and #2 fire and run fine. #3 no spark, but sparks fine when wire from CDI to #2 is swapped to #3.
Don't have manual, but wiring diagram shows pulser coil signals CDI for #1 and #3 and CKP signals CDI for #2. Have provided basic resistance checking info to him for the w/r and w/b from the pulser, and bl/w and bl/r from the CKP. He has not yet traced every wire back to the flywheel, but is taking apart in next day or so. Is the CKP also inside the flywheel, or is it mounted lower down on the casing?
I'm still trying to get my head around how only one pickup coil on the flywheel can provide firing input to two cylinders that are 240° apart in firing ... or does this not matter as long as the + and - are sensed and the CDI does the math?
Thanks!