1989 Honda FL400R Pilot Service Manual, Page 220Get this manual
IGNITION SYSTEM If the reading is far beyond the standard, remove the left crankcase cover (section 8)Disconnect the pulse generator wire connector from the pulse generator terminal and measure the resistance between the terminal and body groundReplace the pulse generator if necessary
ALTERNATOR
It is not necessary to remove the stator coil to make this
AC SENSOR LINE INSPECTION
Disconnect the AC sensor line connetor (4Pwhite) And also disconnect the alternator 3P connector (White)Measure the resistance between connector terminals as follows:
AC sensor line connector terminal (Y)
(1) TO COl UNIT
Alternator 3P connector terminal (Y) AC sensor line connector terminal (G)