2005-2009 Kawasaki Brute Force 650/KVF 650 4x4 Service Manual, Page 472Get this manual
18-6 APPENDIX Troubleshooting Guide
Battery Discharged: Battery faulty (e.g plates sulphated, shorted through sedimentation, electrolyte level too low) Battery leads making poor contact Load excessive (e.g, bulb of excessive wattage) Ignition switch trouble Regulatorrectifier trouble Alternator trouble Wiring faulty Battery Overcharged: Regulatorrectifier trouble Battery trouble