1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 299Get this manual
Running Test, Alternator Output
Disconnect battery cables before proceeding with this check
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
llilltil1000 2000 3000 4000 5000 6000