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Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3343
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I've got a 9.9 merc serial#ob192262 and I've lost spark on

Customer Question

I've got a 9.9 merc serial#ob192262 and I've lost spark on the bottom cylinder I've switched coils and plugs/ wires around and still no spark on the bottom cylinder all connections and grounds appear good to me I'm thinking I must have a bad switch box because I believe if I had a stator/ trigger issue I would lose spark on both cylinders any thoughts before I buy an expensive part?
Submitted: 3 months ago.
Category: Boat
Expert:  Charles replied 3 months ago.

Hello, my name is***** will assist you.

Expert:  Charles replied 3 months ago.

Do you have a multimeter to do some testing?

Customer: replied 3 months ago.
HI I've got a 9.9 merc ob192262 and I've lost spark on the bottom cylinder I've switched coils/plugs/wires and still no spark on the bottom cylinder I suspect a bad switch box because I believe if I had a stator/ trigger problem I would have no spark on both cylinders
Customer: replied 3 months ago.
Any suggestions before I buy an expensive part?
Expert:  Charles replied 3 months ago.

I would test the voltage coming off the stator. There are two wires coming from it. Cranking the engine over you should get 180V between the two wires. This reading would be in AC Volts.

Customer: replied 3 months ago.
Assuming that's ok what's next
Expert:  Charles replied 3 months ago.

Then test the voltage coming from the trigger. If the stator and the trigger test good, then it is the switch box that has failed.

Customer: replied 3 months ago.
Trigger voltage should be lower ?
Expert:  Charles replied 3 months ago.

Yes, very much so. The trigger will only produce around 0.05 to 5V AC.

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