Yamaha 15hp Wires

[thefasterfish]

Theres a set of green wires with a blue cover that are unplugged on this 1991 Yamaha 15 2 stroke outboard motor. We havent been able to bring this motor up to full rpm on the water, just wondering if this could be the problem.

 

[ClassicAQ]

Green wire is for tach signal. I see 2 wires, what color is the other one? Wires can have 2 colors, fyi. What you can also do is look in your service manual, electrical section, and trace the wire.