150 Mercury "Blackmax" outboard engine(1985) -- power tilt is not working -- engine will go down, but will not go up. Makes a clicking noise when switch is used to make the engine go up. Changed the "up solenoid and relay". Checked both switches for faults and corrosion. Now looking for a diagram that shows the connections to the solenoids, or seeking the step to rectify the problem. HELP !