1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 36Get this manual
COlL TESTING The is tested under conditions of actual operation, as the ignition analyzer provides interrupted primary current and measures the induced secondary voltageIf the coil is in good condition and is suitfor use, the induced secondary voltage, as indicated the meter, will fall within the green ("good") area, with primary current adjusted as specified The must removed from the armature plate for this testConnect the test leads from the ignition analyzer to the coil, making sure that the black lead is connected to the ground lead of the coil, the red lead to the coil breaker point lead, and the high tension lead to the coil secondaryWith the coil index adjusted as specified, note the meter readingSee Figure 4-9
Figure 4-9Coil Testing
low reading the tester indicates weak which must replacedNo attempt should made to improve this spark increasing primary current; the is defective if it cannot made to give good reading the specified primary currentcompletely dead is indicated if there is reading