1978 Johnson 55 HP Outboards Service Repair Manual P/N 506997, Page 108Get this manual

1978 Johnson 55 HP Outboards Service Repair Manual P/N 506997, Page 108

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5 AMPERE ALTERNATOR CHARGING SYSTEM
Figure 7-24 Alternator Output Check bConnect rectifier red lead to the generator (GEN) terminal of an OMC Accessories 15 amp ammeter, or any low scale ammeter