2008 DF300 Trim wont go down

[Pdoerner]

My starboard 2008 DF 300 with electronic controls has been running fine since 2009 when I purchased it new. The engine will trip up, but will no longer trim down when hitting the dash control, throttle control, or on engine switch. Replaced the relay on the motor with a new one and problem still there. 12.8 Volts is coming off the relay green lead (up position) when the switch is activated but no voltage then the down switch is activated. I swapped the computer from this engine to the port engine and the problem stayed with the starboard engine, so the computer is fine. Am told that some 2008 Motors had a resister in the wiring harness that may now be faulty.
Not sure where to look for that or how to identify if my motor is one of the few with that resister.
Appreciate any ideas to resolve this matter. Been very happy with the motors. Heading to the islands in 2 weeks for an extended boat trip but dock bound until this problem is resolved.
Thanks!

[redlowrey]

There is a 24pin plug where the down pink wires from the throttle trim switch and the engine trim switch meet, then it goes to the trim relay, pull the plug apart and clean, I think that will be where your problem will be. If You had of put a 12 volt jumper on the pink wire on the relay plug and it would have gone down.

[Pdoerner]

Thank you. I will give that a try... Appreciate it.

[artdf175]

Besides from what Redlowery mentioned
You might check the t/t on the side of the engine
You can swap these switches to double check
My switch got salt water in it & up worked - down didn't
I took the switch out took switch apart and found it shorting out internally
Cleaned it up and put it back in and it worked long enough for me to get a new one
Art