Power Tilt Activates Unexpectantly

[bucky]

I'm guessing this will wind up being a warranty repair, but if I can find the problem, I'd prefer to fix it myself.

I'm running a '99 2110 with a '12 Yamaha 9.9 kicker hooked up to dual controls. Individual power tilt and trim switches for the main and the kicker, and one switch that operates them both simultaneously. No problems since having it installed last fall, but then a couple of weeks ago, out of the blue, the kicker will tilt all the way up on it's own. Fortunately, it hasn't ocurred with the engine running. Once it's up, the tilt motor continues to whine as if I was pressing the button.
If I press "down" on the binnacle control, the tilt motor goes quiet, but the engine stays up. As soon as I release the down button, the tilt motor start whining again. I flip-flopped the trim switches between the main and the kicker, but continued to have the same problem.

The only thing that works for a while is to use the trim switch on the motor. That'll put the engine down. Sometimes it pops right back up and sometimes it doesn't for a good long while and I can operate the engine and trim normally.

I suppose it's electrical. A relay maybe?

Any thoughts?

Thank you.

 

[DaleH]

Sounds like a short, check the harnesses. Corrosion could have built up in it ANYWHERE in its run from the OB to the helm control.

1st place I'd look for is any extension harness that may have been used to lengthen a harness or any connection at either end.

Typically a blue-colored wire (for 'sky') is for trim UP and a green-colored wire (for 'grass') is for trim or tilt DOWN. This goes for most OBs and what Yam uses, see: http://www.maxrules.com/fixyamahawiring.html

 

[bucky]

Great wiring table, Dale. This weekend, I'll start tracing wires from the engine forward.
Very much appreciated. -- Joe

 

[DaleH]

Make NOTE that the common RED wire with the blue & green trim wires is Power. So when Red (Power) and Blue (sky) are connected, the motor goes up. So apparently somewhere in your harnesses or switch connection(s), the Blue appears to have intermittent contact with the Red.

The blue and green leads only determine the rotation direction of the pump, for up or down ...