The ground for the battery (negative battery terminal) is about 16" long and I think it's grounded somewhere behind the shift lever. Check and see if it's not pinched or cut anywhere.
I have my breeze in pieces cause I fixin it to surprise my son for his bday next week. I can take pictures of all the wires under the plastic if you need a reference.
Any clicking sounds when you hit the start button? It could be a bad solenoid. You could jump the solenoid with a set of metal pliers by touching both terminals with the ends completing the circuit. See what happens after that. BTW I am no expert just little things I picked up watching my uncle work on ATV's. He used to be a mechanic at a local Yamaha dealership.