The CDI 5 wire plug color matches this image I found. NONE of the terminals has over .2v DC to battery ground. black/yellow goes to coil like the picture. Kill switch is working, so it is NOT grounded out. How many volts should be on black/red & blue/white? AC or DC? Problems started with several 10-amp fuses blowing with headlight on, now no spark but a 5-amp fuse doesn't blow with headlight on. So, I am assuming a bad CDI or magneto. How do I validate magneto?

https://atvconnection.com/forums/att...1605_hijpg.jpg

 

Well, your diagram shows an AC CDI and nowhere on that drawing does the ignition circuit join the battery circuit, nor should it on AC set ups, they are totally separate. So no way can the ignition components blow a fuse on AC set ups. Follow the wires, if the black/red goes to the stator, you have an AC CDI, if it goes to the ignition switch, (possibly via a kill switch) it will be DC. Read and follow the "help diagnose stator" sticky at the top of this page, but don't take readings as gospel, as different makes of coil will give different readings. Anything way out will give an indication of a fault though. Blue/white, trigger coil is always AC. Red black AC for an AC CDI, or 12v DC for DC CDIs.

 

Thanks, Y-G is 0 Ohms, W - Y is 0 Ohms, B/R-W is 447 Ohms, B/R - Y is 447 Ohms. Engine is a 152FMH. Any recommendations on a supplier for a new stator? It has a sticker on it with "C100-6 12vb 400m".

 

White and yellow have nothing to do with ignition, as I wrote before, take a look at the drawing, ignition stator coils involve black/red and blue/white, usually to earth, though some use coils with a return wire to CDI, rather than earthing them. Looks like the charging circuit, yellow and white, is faulty, so you will need a new stator anyway, but you haven't found the reason for no spark.