1981 Johnson/Evinrude 4HP Outboards Service Manual, Page 36Get this manual
A low reading on the tester indicates weak coil which must be replaced No attempt should be made to improve this spark by increasing primary current; the coil is defective if it cannot be made to give good reading on the specified primary currentA completely dead coil is indicated if there is no reading Check for leakage from the coil (caused by moisture, crackes in the coil housing, or carbon paths) by running the test probe over the outside of the coilReplace any coil which shows any leakageSee Figure 4-13 SAFETY WARNING
High voltage is applied to the condenser in the leakage testHandle leads carefully and turn selector switch to "Discharge" before disconnecting leads from condenser after performing this test
SAFETY WARNING
Perform all tests on the coil on wooden or insulated bench top to prevent leakage or shock hazards
Figure 4-14Condenser Testing