nola mike
Vice Admiral
- Joined
- Apr 22, 2009
- Messages
- 5,519
So I have an '89 merc 2.2hp. It was running like crap, and the points are NLA, so I replaced them with a nova II electronic ignition. Still ran like crap, cleaned the carb. Ran better with a high speed miss. Figured out that water was splashing on the plug/wire, causing the miss. Took care of that, and for about 5 glorious minutes it ran great at WOT. Then died. Now I have no spark.
I'm trying to understand the ignition. It appears that I have the stator/flywheel, and then an external coil. I think what happens is that I get a pulsed primary voltage from the coil in the stator, which supplies the external coil. The external coil has both primary and secondary windings.
When I connect an ac voltmeter to the wire leaving the stator and ground it, I get 2-3volts on the meter.
I took the external coil off. I have 2 connections; the one wire from the stator coil (white) and the spark plug wire. I'm assuming the bolt holes are the ground. I get 5 ohms from the white wire to ground (bolt holes). I also get 5 ohms from white wire to spark plug wire. Spark plug wire to bolt holes is no resistence. Spark plug wire to white wire is 5 ohms. I think this means that my secondary circuit is shorted, right?
What I think SHOULD happen is that white to ground =5 ohms. Spark plug to ground =high resistance, and white wire to spark plug = infinite.
Can someone set me straight on this?
I'm trying to understand the ignition. It appears that I have the stator/flywheel, and then an external coil. I think what happens is that I get a pulsed primary voltage from the coil in the stator, which supplies the external coil. The external coil has both primary and secondary windings.
When I connect an ac voltmeter to the wire leaving the stator and ground it, I get 2-3volts on the meter.
I took the external coil off. I have 2 connections; the one wire from the stator coil (white) and the spark plug wire. I'm assuming the bolt holes are the ground. I get 5 ohms from the white wire to ground (bolt holes). I also get 5 ohms from white wire to spark plug wire. Spark plug wire to bolt holes is no resistence. Spark plug wire to white wire is 5 ohms. I think this means that my secondary circuit is shorted, right?
What I think SHOULD happen is that white to ground =5 ohms. Spark plug to ground =high resistance, and white wire to spark plug = infinite.
Can someone set me straight on this?