Took the boat out a couple days ago for the first time this year. It is a 1985 model year 90 hp v4 Johnson two stroke.
After driving a few minutes I saw the tachometer wasn't working. We continued for a few more minutes, then I slowed down and once it was in neutral before shutting the motor off the tach started working. Upon starting the motor back up after sitting for a half hour it worked right away and for the approx two miles back to the landing. The motor ran like a top the whole time even when tach wasn't working.
I replaced the regulator/rectifier in 2018 and it has maybe at most 20 hours on it (don't use boat much). At the time the tach didn't work at all (not intermittent), which makes me think stator is possibly going bad now. I also replaced gauges in 2018 and tach connections are currently tight.
I am going to track the tach functionality in future outings, but in the meantime tested the stator for ohms but not sure I did it correctly.
Two yellow wires: 0 to 0.1 ohms (continuity)
One yellow to ground: no continuity (my meter is a digital Kobalt that autoscales and shows L0 for high ohms)
For the ground I used one of the unpainted bolt heads securing one of the coils. Tried with both yellows, same results.
I think I used the correct yellow wires. Two come out from a connector under the flywheel. These are the two I used. Two also come off the regulator/rectifier. I unscrewed the screws from the terminal block and unsecured the wires so I was only testing the ones from under the flywheel. One from under the flywheel and one from the regulator/rectifier each are screwed to terminals 1 and 2.
I read ohms readings don't always tell the whole story. How do I test using a DVA?
Thanks for the input. I can switch out parts but am new to diagnostics.
After driving a few minutes I saw the tachometer wasn't working. We continued for a few more minutes, then I slowed down and once it was in neutral before shutting the motor off the tach started working. Upon starting the motor back up after sitting for a half hour it worked right away and for the approx two miles back to the landing. The motor ran like a top the whole time even when tach wasn't working.
I replaced the regulator/rectifier in 2018 and it has maybe at most 20 hours on it (don't use boat much). At the time the tach didn't work at all (not intermittent), which makes me think stator is possibly going bad now. I also replaced gauges in 2018 and tach connections are currently tight.
I am going to track the tach functionality in future outings, but in the meantime tested the stator for ohms but not sure I did it correctly.
Two yellow wires: 0 to 0.1 ohms (continuity)
One yellow to ground: no continuity (my meter is a digital Kobalt that autoscales and shows L0 for high ohms)
For the ground I used one of the unpainted bolt heads securing one of the coils. Tried with both yellows, same results.
I think I used the correct yellow wires. Two come out from a connector under the flywheel. These are the two I used. Two also come off the regulator/rectifier. I unscrewed the screws from the terminal block and unsecured the wires so I was only testing the ones from under the flywheel. One from under the flywheel and one from the regulator/rectifier each are screwed to terminals 1 and 2.
I read ohms readings don't always tell the whole story. How do I test using a DVA?
Thanks for the input. I can switch out parts but am new to diagnostics.