[2005GZ250]

Give the battery a good slow charge overnight, after charging use a volt meter and check the battery it should be around 12.4 to 12.8 volts. Install the battery and start the engine, now check the voltage it should be 13.5 to 14 volts. If the battery voltage does not change with the engine running then you may have wiring or alt problems. If the voltage goes up withe the engine running then not the voltage with the engine stopped and then check it a few hours later to see if the battery voltagt has dropped, if it has then you may have a bad battery or a short in the wiring.