What has to be rmoved on a 2003 Yamaha Kodiak 400 ATV to be able to remove the radiator fan motor ?

Get a battery tender to put on the battery when you aren't using it to keep it fully charged. Check battery connections and grounds.

Check the starter relay plus the starter and solenoid.

Call an auto electrician. The videos may help diagnosis.

It could be a bad stator

replace tire should fix it and dont ride on paved road . tires are not rated for paved roads.tie rod ends , wheel bearings loose or bad , control arms . raise front end and look under atv wear if bad enough will b seen. shake each tire and have helper look under at same time to locate the problem. if one side bad replace both sides to prevent more trouble later on. always support both sides w/jack stands before looking under atv. be safe when shaking atv while on jack stands.

IS THE CARBURETOR AIR FILTER CLEAN?

According to your VIN Its 1997

The complete info from dmv is
Destination Market: U.S.
Make: YAMAHA
Manufacturer Name: YAMAHA MOTOR CORPORATION
Model: YFM400FW Kodiak 4x4
Model Year: 1997
Plant City: Hamamatsu
Vehicle Type: MOTORCYCLE
Plant Country: Japan
Body Class: Motorcycle - All Terrain Cycle (ATV)
Drive Type: 4WD/4-Wheel Drive/4x4
Displacement (CC): 400
Displacement (CI): 24.409497637
Displacement (L): 0.400000

check youtube for generic valve adjusting procedures, the kodiak is like most of them.

remove the carb, then remove the float bowl. you will have to turn the carb up-side down and set your floats level. just bend the little metal tab to so.

1998 Yamaha Kodiak 400 Wiring Diagrams 2001 yamaha kodiak wiring diagram... This might help you to find the problem

look here:

http://www.yamahapartshouse.com/oemparts/#/l/yam/50038d42f870021f60a0ba7a/1999-kodiak-4wd-yfm400fwbl-parts

Sounds to me like you have a bad ground wire somewhere