Trying to diagnose a "no spark" problem, and want to test the plug that goes into the CDI. From what I've been able to research, it's a DC, 4 wire setup. I have a voltmeter and know how to use it a bit and can give you the readings if someone tells me what to test.

The quad is a 110cc, Loncin. I believe there is no 12 volts coming into the harness, but need specific instructions how to verify that.

Appreciate all the help.

 

Personally iv always found it easier to just order a couple of new cdi's off ebay and swap them out. Iv never been able to get reliable readings testing s cdi

 

I need to know how to test the current coming into the CDI in the 4 pin pigtail. Changing out random parts , guessing, usually leads nowhere, FAST

 

Look up the Honda gy6 information and schematics. These are a clone of those engines. I agree with you, replacing parts to fix an issue is never a good idea. Properly diagnosing the problem before replacement is the only way.

 

Great news. Since the yellow wire to geound didn't get me 12v DC, I ran a tester wire from the battery + post directly to CDI plug and bam.... I now have spark.