Chrysler 70, 75 and 85 HP Outboard Motors Service Manual OB 3438, Page 74Get this manual
3If battery and cranking voltage are all right, proceed as follows:
AConnect test leads from C-O tester as shown in Figure 10
BAdjust battery voltage to 12 volts on voltmeter by turning voltage adjustment knob counterclock wise Turn indicator knob to full clockwise position so that mark on knob is at100" setting
CAUTION
When making connections of test leads, the "C-O IN" lead is "LIVE" when battery leads of tester are connectedConnect battery leads as