1993 Johnson Evinrude "ET" 60 degrees LV Service Manual, P/N 508286, Page 293Get this manual
Motor Test, No Load Securely fasten motor in suitable fixture before proceeding with this test1Use 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
3Attach or hold vibration or mechanical tachometer to the motor while performing this test4Monitor motor RPM and current drawRefer to the chart below for the correct specifications for your motor