Tail ilght dimming when engine is reved

4 replies to this topic
  • Paul2005

Posted March 06, 2007 - 06:20 PM


Hi All,

Have a problem with the back tail light dimming when the engine is reved, i think it might be the regulator but the front lights are not dimming! does anyone know if the front lights go through the regulator as well? if they don't i wouold guess it the regulator / rectifier thats gone. Whats everyone think

Many thanks

  • cleonard

Posted March 06, 2007 - 06:30 PM


It could be a poor connection. Revs make vibrations and that might be making a poor connection worse.

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  • porterdog

Posted March 06, 2007 - 08:55 PM


does anyone know if the front lights go through the regulator as well?

Hard to say with no information about your bike...

  • Paul2005

Posted March 07, 2007 - 08:18 PM


sorry porterdog its an 97 xr600

good point cleonard i did have problems before with the connection but i thought i done a good job repairing it, must go over the connections again

  • bigredxr

Posted March 08, 2007 - 03:31 AM


Put a dvom on the battery and see if the voltage drops when u whack the throttle. Your looking for a signicant drop also 9.6 to 10 volts. If it does the ignition system is pulling the voltage to fire the ignition and this would indicate a weak charging circuit. Also check your battery static voltage 12.2-12.4volts. 13.4 to 14.2 approx when running. Our take 2 sec. and have it tested. Also like u said check all connections at pwrs and grds. good luck:thumbsup:

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