2013/2014 Winter Bike

Howdy y'all. Just bought myself a 2004? Yamaha 400 with electrical Gremlins aplenty. Runs good (after jumping the starter solenoid relay terminals with the helpfully included with the sale pliers) but no fan when my wife's 03 Kodiak 400 had fan and the starter button makes it to the starter solenoid but the ECU side isn't happy. This seems to be a lively forum with manual downloads being supported so hi.
Oh yah, and you can get two Kodiak 400s on a 5x8 trailer... I bought a nice 14' trailer as soon as possible after this.

I am a new atv owner...I bought a used atv this summer (pretty sure it is a wolverine but reg card from last owner didnt actually say that so idk for sure). It ran great for most the summer and early fall but one day I tried starting it and it turned over a while without starting and then suddenly it quit turning over at all. No click or anything.
I charged battery and light turns on showing neutral and heatlight can go on.
A few other things that may be pertinent: The pull start is missing, I have a fluke multimeter but not many other advanced tools (or relevant experience), there is an extra aftermarket led light attached to front but it doesnt work either... never looked into why since I didnt need it. 
I looked for a fuse box and didnt find one.
Please recommend some easier things to try first as I really want to avoid taking it in if I can (having one income and 4 kids can keep out extra cash, plus I want to learn). Pictures would be awesome if possible. Thanks! 

I have recently rebuilt my Yamaha warrior 350 engine and when I got it all back together with no “spare parts” i went to start it and realized it’s in reverse. I went to put it in drive and the shifter won’t budge, I took the linkage off and tried to use vise grips but it won’t budge at all. Any help would be greatly appreciated. I’m hoping it’s not something internal! 

I have a Yamaha Big Bear 350 and the reverse doesn’t work, it shifts from low to high easily but it won’t go back to reverse. I’m new to this stuff, so I’ll take any help. Any ideas? 

Where can I find a wiring diagram for my 2005 450 Kodiak. Thanks.