1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 294Get this manual
Motor Test, No Load
fa.sten motor in suitable fixture before proceedmg with this test
1Use battery rated at 360 CCA (72 amp hrs) or higherThe battery must be fully chargedto specific gravity of 1.260 to 1.280 corrected to temperature of 80 (2r C)Refer to Battery Specifications, Electrical Section2Connect 0-50 amp ammeter in series with the battery's terminal, ammeter RED lead toward battery
rv 3Attach or hold vibration or mechanical tachometer to the motor while performing this testrv 4Monitorthe correct specifications for yourRefer to the chart motor RPM and current drawbelow for motor5The motor shaft must rotate clockwise, as viewed from the pump end, when battery "+" is applied to the BLUE lead