2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 196Get this manual
Tilt cylinder and trim cylinderPower trim and tilt electrical system 3Connect the light green (Lg) lead to the positive battery terminal and the black (B) lead to the negative battery terminal as shown4Check for continuity between terminals and 3Replace if there is no continuity Lead color Switch position Up Free 5Connect the digital circuit tester between power trim and tilt relay terminals and 36Connect the sky blue (Sb) lead to the positive battery terminal and the black (B) lead to the negative battery terminal as shown7Check for continuity between terminals and 3Replace if there is no continuityDown Sky blue (Sb) Red (R) Light green (Lg)