Re: 1976 johnson 115 hp v4 no spark
NO SPARK OR INTERMITTENT SPARK ON ONE OR MORE CYLINDERS:
1. Disconnect the Yellow wires from the rectifier and retest. If the engine has good spark, replace the rectifier.
2. Check the timer base resistance and DVA output (see NO SPARK ON ANY CYLINDER above).
3. Swap the timer base wire sets (swap the #1 & #3 pair with the #2 & #4 pair) and see if the no spark problem follows a timer
base wire.
4. Check the DVA output on the Orange wires from the power pack while connected to the ignition coils. You should have a
reading of at least 150V or more. If the reading is low on one cylinder, disconnect the Orange wire from the ignition coil for
that cylinder and reconnect it to a load resistor. Retest. If the reading is good, the ignition coil is likely bad. A continued low
reading indicates a bad power pack.
5. Visually inspect the ignition coils for burned or discolored areas and cracks in the casing (indicating arcing inside the coil).
6. Swap the ignition coil with one that is sparking correctly
You may need a DVA adapter. Like this:
http://www.usatoolwarehouse.com/usatoolwarehouse/ESI-640.html
