The alternator is probably not charging, put a multi meter across the battery terminals, a bit above 12 v with engine off, should rise over 13v with engine running( some alternators charge up to 15-16v)
Check alternator output and the regulator- the regulator may not be working and the battery got overcharged badly
SOURCE: 1992 yamaha fzr 600 genesis
use a vom/ meter on current setting put in circuit ..take hot off battery attach one lead to bat + the other lead to heavy cable u just disconnected. but 1st charge bat to full. see current draw. start to pull one fuse at a time till current drops. that circuit is the culprit. then youll need to find out why is drawing w/ bike off. wire chafed ? minor short.. or when running meter on battery 14.5 volts not running 12.5 volts if the vovtages don't go up when running regulator or altinator is bad or bat wire .. get the manual.. a big help...
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