Re: New guy with 89 i/o questions with trim
There should be 2 buttons per outdrive. As Seapuppy was saying, one is for outdrive Trim and one is for Trailer. The sets of buttons which allow both up and down movement are the outdrive Trim. This has a sensor limitor and won't allow you to raise the outdrive up(up = OUT; Down = IN) beyond a certain point. This is the only set of buttons you use while underway. the trim limiter acts as a safety mechanism and won't let you bring the drive OUT beyond a certain point. You wouldn't want to raise the drive out of the water while underway.
The single button which ONLY raises the outdrive is the Trailer button. This bypasses the trim sensor and lets you raise the drive all the way up. This would be used if trailering the boat, or if achored in shallow water. I would NEVER run the drive beyond the Trim limit as this could put undo pressure on the internal components. If I'm in shallow water, and have my drive up all the way with the trailer, i'll lower the drive all the way down, then raise it to the limit with the trim up button before starting and running. then when I get to deeper water, i'll lower the drive before advancing the throttle beyond headway speed. then trim up after I come on plane (again, along the lines of what SP was saying).
There is no Down trim limiter (beyond the physical limitation of the range of the drive), so when the trailer button is used
to raise the drive beyond the trim limiter, the Down trim button will lower it all the way.
With the engine stopped, you should be able to use the trim UP button to raise the drive up until you hear it stop. Go back and look at the drive. Then hit the trailer button and you will hear it continue to rise beyond the point where it stopped when using the trim up button. Now go look at it again and notice the difference. Then use the trim down button to bring it all the way back down again.