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Hello. My name is Tan.
Locate the switch box on the side of the motor and disconnect the black/yellow wire now check for spark. The switch box is the box that the ignition coil green wires connect to.
Post back with engine serial number and findings please?
Those are the trim switch wires. They should connect to the trim switch in the control. You should have those colors coming out of the wiring harness that connects to the engine harness.
# ***** is the switch box. http://www.marineengine.com/parts/mercury_marine_parts/static/img/MERMAR/13290/11.gif
Ok we will need to do some further testing. Do you have an ohm meter and a peak reading volt meter or a DVA adapter for your meter?
Ok we need to disconnect the wires coming from the stator to the switch box. Do you have green wires coming from under the flywheel or red and blue?
Ok just reply back as you have been. I will get your reply.