Originally Posted by firefighter66255
I have a 2000 e-ton 90 Thunder atv that is not getting a spark. I took out the plug and grounded it and then tried to start it, no spark. New battey and starter...
According to the published wiring diagram for your quad, Etons are a little different than generic Chinese when it comes to CDIs. The kill switch connection (black/white wire) must be grounded to run, and open to kill spark. This is backwards from a generic chinese cdi, which must be open to run and ground to kill spark.
Note that I have never seen an Eton quad - I'm just looking at published wiring diagrams, using my electronics knowledge to analyze what I see, and relying on info from other forum posts. This isn't the same as real practical experince. But it is the best I can do.
Unplug the CDI, turn on the ignition switch and set your "stop" switch in the "run" position. In your wiring harness measure the resistance of the kill switch pin to ground. What do you measure? It should read zero ohms. Set "stop" switch in the stop position. Repeat the resistance measurement. What do you measure? You should see an open connection (infinite resistance).
Kill switch circuitry seems the most likely cause of your no spark problem. If not, the next step will be to measure the CDI ignition power source from the stator, then the timing trigger signal voltage. There are some things we can't measure (such as the coil breakdown voltage). But a lot of things can be measured, and we can use this measured info to eliminate or identify simple things (and even some non simple things). Start with the simple stuff, then escalate up from there...