1980 Johnson 2HP Service Manual, Page 30Get this manual
COIL, CONDENSER AND BREAKER POINTS
TEST determine accurately the condition of components of the ignition system, an ignition analyzer should usedWithout the use of test equipment, coils, condensers, or point assemblies replaced needlesslywide variety of ignition analyzers is from various facturersIn addition, some automotive testers having the proper specifications useduse of the Graham, Merc-O-Tronic, or Stevens ignition analyzers is particularly recommendedSee Figure 4-20Detailed instructions for the use of tester are provided with the unit; therefore, only general information is given hereSee Test Specifications, Section 2components of the ignition system should checked, though replacing part seems to corrected the troubleFor example, replacing points increased spark, but further improvement might realized if condenser is found to weak and is replacedCOIL TESTING 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 suitable for use, the meter wiH so indicatecoil must removed from the armature plate for this testnect 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 4-10low reading the tester indicates weak coil which must replacedNo attempt should made to improve this spark increasing primary current; the coil is defective if it cannot made to give good reading the specified primary currentcompletely dead coil is indicated if there is readingCheck for leakage from the coil (caused moisture, cracks in the coil housing, or carbon paths) running the test probe over the outside of the coilReplace coil which shows leakageSee Figure 4-11