Testing T/T sensor

[jackmanjls]

Re:2006 F90TLR yama.

My T/T doesn't give any indication at the CC.

I have the metal finger that the TT sensor arm rides on, it's not the old style plastic finger.

I unplug the long sensor wire at the connector on the side of the motor, this connector is on the opposite end of the sensor arm. I disconnect the 2 screws that hold the sensor in the front of the motor. I put a ohmmeter across 2 connector wires and moved the arm on the sensor up/down. The resistance went from about 50 to 200 ohms, this appears to be normal.

I reinstalled the sensor along with the stationary finger arm and tilted the motor to the down position and monitored the resistance. As the motor started up the resistance changed accordingly. At the transition point from trim to tilt the resistance indicated infinite resistance.

Does this mean the sensor is bad or is this normal operation? It seems like the resistance change should be proportional through the complete T/T range.

[boscoe99]

It is a trim sender. Not a trim and tilt sender.

The sender typically will cause a Yam gauge to indicate full down when the motor is fully down. You adjust the cam to make it do this. At the top of the trim range the needle (analog) or bars(digital) will indicate the full up position.

During normal boating use a motor is not operated when it is in the tilt regime. Therefore, the sender and gauge don't work when the motor is in the tilt mode.