If you have an multimeter you can do alot on a machine like that. The manual is good for givin you specs but alot of times its just knowing how the charging system works. You can hook the ampmeter In between the battery and the battery terminal with the machine off and that will tell you if you have a draw. If not The most common thing I see is the Regulator Rectifiers go bad, Dont jump to any conclusions just yet though. First thing first, Was this a properly preped battery or was it a autozoner battery they just filled and sent you on your way with. Battery Prep is extremely crucial. Make sure all your conections are good. Check to see if you have good battery juice to the reg/rect if so you need to make sure you have good stator output, which will be the two/three yellow wires going into the Reg/rect. You should have somthing like 35 A/C volts at each leg at around 3k RPM (confirm that with the manual) This should be a good start, Polaris manuals are very imformative on wiring procedures and probably better at wording it than myself but hopfully this helps.
Just got a new dyno, callin it my new baby boy.
Willy built motor, 100% custom
personally built 3mm stroker crank
specially cut reeds
Major head work
Major cyl. work
Cases cyl all matched
2000 CR250 stator and ignition
Much more motor work
Basically stock chassis Shortened shocks