Yamaha Grizzly 600 Starting Problems

[autolec]

New here and I need some help, please.  I have a small shop and I usually don't work on ATVs but a customer wanted me to look at his.  He had a main fuse blown for his starting for the ign switch.  He was using a screw driver and jumping across the sol.  I replaced the fuse and that fixed the tarting problem.  Started and ran from key and starting switch just fine.  He then wanted me to add a manual switch to his cooling fan.  Should have said no, but,thought I would shoot my self in the foot and help.  I was trying to see it the fan would run by sending 12 volts to the hot wire.  I THOUGHT I had found a connection from the motor to the sensor.  Unplugged the red wire at the connector ( in attached picture) and jumped 12 volts to it.  When I touched the wire to the pos. battery terminal, it arched like a short (NEVER GOOD)!  Hooked the wire back to the terminal and tried to start the machine.  Now, it will spins over as it should but there is no spark.  I have to assume that I blew a module or controller.  Question is -- What did I blow and where the heck is it?

Any suggestions and help would be greatly appreciated!

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