Aileron Position Indicator Stuck

[PhilzSkyHdx]

Trim Motors: Ray-Allen
Trim Panel: None
Problem: Aileron Trim Position stuck to full right (if I remember correctly)

I recall looking at the Sensor Debug info (C37, p.10 perhaps) for the Aileron Trim and its at 5.0V.
I moved the trim Left and Right (functional) but the voltage stays at 5.0V. Does that indicate an open
circuit at the Trim motor sense pin? (iow, is it pulled up to 5V when it floats?).

My plan is to measure the voltage for the position sensor at the Trim motor. Which pin no. of the 15 pin connector
on the trim motor is the sense signal? If the wire colors are like Dynon says, It should be easy to spot.

from Skyview: Trim and Flaps Position Potentiometers
"Connect Pin 18 (+5 Volts Auxiliary) from the SV-EMS-220/221 to the +5 Volts input on your trim/flap position sensor
(Dynon says WHT/Orange wire). Connect the ground input on the sensor to a ground common to the SV-EMS-220/221’s signal ground." It says SIGNAL is WHT/GRN, so maybe I answered my own question.

thanks for any guidance on this

 

[GKC Aviation]

I had this exact thing on a customers RV-6 a while ago.
Trim indicator stuck full one way, but trim operation was fine.
It was a broken wire at the trim actuator, one of the position sense wires.
It was broken where the builder had put a plastic connector in to enable removal, behind the wingtip.

 

[PhilzSkyHdx]

thanks GKC. I'll check the wiring at the trim motor. I hope mine's that easy.

 

[PhilzSkyHdx]

Nope, not that easy. Not an external wiring problem. Cut the 2 wires, WH/BLU & WH/GN to measure the resistance.
(the WH/OR is the =5V for the internal pot). This should vary between 5K and about 0 ohms - mine measured 5K to 4.4K as I extended and retracted the actuating arm (both in the airplane and at home using a 9V battery to power the 2 White wires).
Yep, its bad. Sent it in to Ray Allen for repair.
They confirmed bad wiring internally and offered to repair it, but I opted for a new T2-10A trim motor which they sold me for 1/2 price (1/2 of $259) of a new one.
So for under $170 (including shipping) I now have a new trim motor.

The hard part: had to remove the flooring in front of the seats to find this sucka. Its crowded in there and not the easiest space for
an old guy like me to work in.