Tilt and Trim ?

[Sans Peur]

On my Yamaha OX66's I have a problem with the trim. When I push the "up" trim button for the Port engine BOTH engines go up. Only on that one button function, the down controls only the port engine and the starboard switch controls only the starboard engine. Somehow I am getting voltage backfed through the system. Is there a gate diode in there somewhere. I can not find any schematics for it.

I know the button on the throttle handle is supposed to work both engines. and ties them together. I figure there must be some type of diode that stops feed back when the individual buttons are used but I can't find one.

[Enough Already]

If you don't get the answer here, call the Yamaha support center at 866-895-1626. They have been pretty helpful in the past. Do you have the 704 binnacle manual? That might help as well.

[Sans Peur]

Don't have the Binnacle Manual. I have one of the aftermarket manuals and it doesn't do a very good job in the binnacle.