Yamaha F100B F100C Outboards Factory Service Manual, Page 294Get this manual
Bracket unit
4Check the circuit breaker for continuityReplace if there is no continuity
Checking the power trim and tilt motor
1Check the commutator for dirt or foreign substancesClean with #600 grit sandpaper if necessary
S60C7950
5Check the base for cracks or damageReplace if necessary2Check the commutator undercut for dirt or foreign substancesClean with compressed air if necessary3Check the armature coil for continuityReplace if out of specifications6Check the oil seal for damage or wearReplace if necessary