Chrysler 70, 75 and 85 HP Outboard Motors Service Manual OB 3438, Page 73Get this manual
AConnectBATT P" and "BATT N" test leads from
testerFigure 9Also remove BLUE wire of engine wiring harness from the terminal block to prevent engine from starting
WARNING
When these test leads are connected, the "C-O IN" test lead from C-O tester isLIVE" Be certain it does not contact any metallic object or sparks may occur and possibly cause ignition of gasoline vapors
-Figure 8
BTurn voltage adjustment knob clockwise all th wayRead voltage on voltmeter of tester Voltag must read 12 volts minimum