2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 228Get this manual
TRBL SHTG Bracket unit
Troubleshooting
Symptom: Power trim and tilt unit does not operateListen for the operation sound of the power trim and tilt relayCan the operation sound be heard? Yes Check the voltage between each terminal of the PTT relay coupler when pushing the power trim and tilt switch Between the sky blue (Sb) lead and black (B) lead Between the light green (Lg) lead and black (B) lead
Can 12 be obtained? No Listen for the operation sound of the power trim and tilt motorCheck the fuse for continuity