Chrysler 100, 115 and 140 HP Outboard Motors Service Manual, OB 3439, Page 80Get this manual
EReturn indicator knob back to100" setting and repeat test as outlined in steps through EReadings should repeat within pointsCompare readings with chart below pulley or you could hit live cylinder and get strong flywheel kickback
Voltage
Minimum Values
Spark Plug Lead Wires1Remove the number one (#1) spark plug wire from the spark plug and insert 1 4" boltapproximately 1" long into the sparkie spring Figure 132With insulated tongshold the bolt about 1 4" away from one of the cylinder head bolts Figure 14
Test reading values shown with respective voltage are the minimum values for C-O unitsFIf C-O unit checks all right in previous stepsadjust battery voltage to volts on voltmeter by turning voltage adjustment knob counterclock wise Turn indicator knob so that mark on knob is at100" settingGTest C-O unit as outlined in steps through ECheck values against chartIf values are at minimum or aboveC-O unit is all rightIf values fall below minimumC-O unit is defective and must be replaced