1978 Johnson 55 HP Outboards Service Manual, Page 108Get this manual
5 AMPERE ALTERNATOR CHARGING SYSTEM
DESCRIPTION The charging system consists of the alternator, the rectifier diodes which change the alternating current output of the alternator to direct current, and the battery itselfThe alternator is made up of two partsthe flywheel with cast-in magnets, and the stator assembly which is bolted to the crankcaseThe stator assembly is made up of coils wound over laminated iron coreThe flywheel turns around this assembly inducing alternating current in the coilsThe rectifier assembly converts the alternating current to direct currentThe rectifier is mounted on the electrical components bracketSee Figure 7-22
If an induction ammeter is not available, proceed as follows:
aRemove terminal board screw connecting rectifier and motor cable red leadsSee Figure 7-24