1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 267Get this manual
Running Test, Alternator OutputAll Models
INote Disconnect
battery cables before proceeding with this
1Remove the rectifier red lead from the terminal board2Wire to 40 amp ammeter in series with the rectifier red lead and the wiring harness red leadGuard against any red wire, its terminals, or the ammeter coming in contact with engine ground while the engine is runningContact may cause arcing
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