1973 Johnson lost spark

[Grub54891]

Model number- 85eslm73m
Serial number-j3892787
Yup, lost spark to all cylinders. This is not my boat but I'm trying to help out a buddy. He pulled the stator, and trigger and stopped by, I ohmed the stator, I get around 600 ohms on the yellow wires, I get basically nothing on the other pair of wires.
. The triggers have continuity, and both the stator and triggers are not shorted to ground no matter how they are tested. I'm thinking power pack, but I have no clue how to test that. We do have power getting to all the components so it has to be something?

 

[F_R]

The yellow wires are for charging the battery and have nothing to do with the ignition system. The brown wires pair are what charges the power pack. If you are getting no continuity at all, there is an open----either a broken wire or open winding in the stator's two big coils. That certainly would make it quit.

 

[jonesg]

Model number- 85eslm73m
Serial number-j3892787
Yup, lost spark to all cylinders. This is not my boat but I'm trying to help out a buddy. He pulled the stator, and trigger and stopped by, I ohmed the stator, I get around 600 ohms on the yellow wires, I get basically nothing on the other pair of wires.
. The triggers have continuity, and both the stator and triggers are not shorted to ground no matter how they are tested. I'm thinking power pack, but I have no clue how to test that. We do have power getting to all the components so it has to be something?

I woud suspect the pack too IF theres power going in and nothing coming out when cranking.

 

[Grub54891]

Thanks to both of you. I knew the yellows were for charging, but the other two were suspect as well with no continuity. Now to find one. I think he wants to try a power pack first as its cheaper than the stator, but indeed the stator is more of the suspect. The stator don't look bad by appearance no melting or discoloration. Appearances can be deceiving.

 

[racerone]

Well-------I think 600 ohms on the yellow wires is way out of line.---Should be more like ----1 ohm---- on the yellow wires !!!-----And 12 volts is not used to make spark on this motor.

 

[Grub54891]

Well-------I think 600 ohms on the yellow wires is way out of line.---Should be more like ----1 ohm---- on the yellow wires !!!-----And 12 volts is not used to make spark on this motor.

I had the meter set to 2000. Didn't know where to set it. So the other two wires won't get continuity when tested? Or are you saying the pulse from the magnets will give it what it needs? I know silly questions, but I've never had to test a stator before.

 

[F_R]

There should be some kind of continuity between the two brown wires---I just don't know the Ohms spec without looking it up. Flywheel magnets pass by the two large stator coils, and generate electricity as they do. That electricity is fed through the brown wires to the power pack. This charges the capacitor within the power pack, etc, etc etc.

 

[Grub54891]

Thanks all so far for the info. I'll transfer all this to my buddy.

 

[Grub54891]

Update. Went there to look things over last night. Checked a few things, couldn't find an issue. Ended up unplugging the main harness plug, looks perfectly clean, but I put dielectric grease on the pins when putting together, spark returned! A little tweaking of the pins did the trick. Thanks for the help.