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When a battery is giving 18.8 volt, the battery is defect, or your Volt (multi) meter is not calibrated or defect.
Check if all cells have enough fluid and if possible measure each cell to establish if one or more are defect.
each cell can be a little over 2 volts, but 3 or more is really not possible for a working lead acid battery.
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...
I HAD THE SAME ISSUE. CHECK YOUR VOLTAGE OFF O THE MAGNETO, IT SHOULD BE IN THE 25V RANGE. IF THAT CHECKS OUT OK CK THE VOLTAGE IMEDIATLY AFTER THE VOLTAGE REGULATOR, I BET IT IS BELOW 14V. THE FZR IS PRONE TO HAVING THE REGULATOR GO BAD (THE OLDER ONES HAVE NO COOLING FINS AND THEY BURN THEMSELVES UP). THE BEST ONE TO BUY IS THE NEWER VERSION FROM A 1999 FZR, IT HAS COOLING FINS WHICH GREATLY PROLONGS THE LIFE. YOU HAVE TO DO SOME SLIGHT WIRING MODS, BUT NOTHING ANYONE COULDN'T DO. SEARCH FOR FZR REGULATOR UPGRADE AND IT WILL EXPLAIN EVERYTHING! I HOPE THIS HELPS! GOOD LUCK!
Hi! Before this problem occurred did you charge the battery whilst still connected to bike? If so the regulator or Alternator may have been damaged? Can you get the bike started by bumping (Push start) or a new fully charged battery? if you can then buy/borrow a Multi Meter and set it on Direct current 12Volt put Red+ lead from Meter to battery+ and Black- Negative lead from meter to Battery Negative- it should read between 13.8 and 14.8ish volts. If no fluctuation when revs are increased and stays at 12.5ish volts then unfortunately either the regulator or alternator is faulty. If you can't use a meter do the lights go brighter from tickover and revs to 1500? if not then possibilities again for Charging Grief. Sorry to bring possible bad tidings but your looking in the right area. Paul 'W' Onyer~EDson(:0) {#>< U.K.
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