I installed a 1980 Johnson 70 hp power head (don't know the history of it but it has good compression) on my motor. The first thing I did was check the spark. I found the top cylinder not firing.
-I then tested the resistance of the trigger coils and they were all in tolerance (#1 was 15, #2 was 17 and #3 was 18 ohms).
-I then tested the coils (OK), ignition switch (OK), the power pack/trigger coil and the power pack/coil connectors (OK). I tried all combinations of trigger outputs to power pack inputs and outputs to coils, name it I tried it and confirmed that all was OK except the power pack?s #1 circuit will not fire a plug.
-I borrowed a power pack and with it got good blue spark on all cylinders 1, 2 and 3.
-I then test ran it in the water, it was a dog. When I got back I again checked the spark; #1-No spark, #2-Blue spark, #3-Blue spark.
It seems coincidental that #1 failed again, like something is taking that circuit out. Someone told me to check the voltage on the black/yellow wire to the power pack; I will look at this next. If I could afford it I would purchase a timing plate, power pack and one ignition coil just to be sure but that would cost almost as much as the motor is worth.
Could a bad ignition coil or a bad trigger coil take out one circuit of the power pack?
Any ideas on what is most likely the problem?
Thanks, Kevin
-I then tested the resistance of the trigger coils and they were all in tolerance (#1 was 15, #2 was 17 and #3 was 18 ohms).
-I then tested the coils (OK), ignition switch (OK), the power pack/trigger coil and the power pack/coil connectors (OK). I tried all combinations of trigger outputs to power pack inputs and outputs to coils, name it I tried it and confirmed that all was OK except the power pack?s #1 circuit will not fire a plug.
-I borrowed a power pack and with it got good blue spark on all cylinders 1, 2 and 3.
-I then test ran it in the water, it was a dog. When I got back I again checked the spark; #1-No spark, #2-Blue spark, #3-Blue spark.
It seems coincidental that #1 failed again, like something is taking that circuit out. Someone told me to check the voltage on the black/yellow wire to the power pack; I will look at this next. If I could afford it I would purchase a timing plate, power pack and one ignition coil just to be sure but that would cost almost as much as the motor is worth.
Could a bad ignition coil or a bad trigger coil take out one circuit of the power pack?
Any ideas on what is most likely the problem?
Thanks, Kevin