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Your 07 arctic cat 400 auto has DC ignition so the trigger coil is what the cdi is looking for .. ALSO the Procom PE-C-AS/K400-A when it blows the fuse, tells you its the wrong one - if you check the manual for the wiring diagram you will see 12v on your bike is going direct to ground on that cdi as it's wired for a different model - you need the correct service manual with correct pinout on your plug at the cdi - this is common, the trigger coil will have 3+ peak voltage you will have to find a manual I will post the page if able. I added a pdf on the wiring for the 2007 , note check the wire colors on your auto to the pdf you can rotate and zoom in, that cdi fits the dvx model I think, if you contact the company they will provide the cdi pin out but really they should have provided the correct one. 07 ac 400 auto.pdf

It's best to check the stator and trigger coils by testing their ohms. A lot of cheap digital meters don't record very short voltage waves such as you get when cranking the engine over. They might show nothing, or give really erratic readings. If you have an old fashioned analog gauge(with a needle), they are better for checking voltage outputs. It's best to get the book and get the correct ohm or voltage readings, but as a general rule, stators have very low ohms, perhaps one or two at most, and the trigger coils are mostly in the low hundreds, perhaps from about eighty to one fifty ohms. Those are general figures for all makes. Most of the time, if you check there is continuity, and no shorts to earth, and some voltage coming out of the stator and trigger, then you can assume for the time being that they are ok, and go on and look at the other things, such as wiring.