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Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11077
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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I have a 1989 150 gt pro series motor the problem that i am

Customer Question

I have a 1989 johnson 150 gt pro series motor the problem that i am having is that one min or day u will have spark the next u wont with out changing or doing anything to it
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.

Hello Jason. My name is Tan.

This can be hard to troubleshoot.

Do you have spark now?

The first thing we want to eliminates is the stop circuit. Disconnect the black/yellow wire when you have no spark. Does spark return?

The other tests we can perform only when you have no spark is a voltage output test. This requires the use of a peak reading volt meter or a DVA adapter. Do you have either?