My battery is not charging when bike is running.how do i test the regulator,what voltage should i be looking for.what about the alternator,the voltage does not increase when i rev the bike just slowly decreases until flat.thanks for any advice..jazz
When you put a voltmeter across the battery terminals, you should get >13.5V (typically) with the engine running.
If less than this then your charging system is faulty and your battery will not charge.
See this personally authored thread for a diagnostic guide on how to determine whether you have a problem with your stator or Rectifier/Regulator - inlcuding some cold resistance checks you can do on the R/R to determine if it is shorted.
[url]http://www.triumphrat.net/speed-triple-forum/104504-charging-system-diagnostics-rectifier-regulator-upgrade.html[/url]
It was written initially for Triumphs, but applies to ANY 3-phase motorcycle charging system.
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This will solve the problem or point you towards the cause of problem. Thank you for using fixya.
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