400f surging issue?

wilber551

dirt/street
so when i first got my cb400 up from the dead the wiring and lights all worked fine. then after about 50 miles the intire light system started to dim and get brighter from about 2000 to 4000 rpm then stop in the higher rev. what causes this? thanks!
 
Regulator, perhaps? A multimeter across the battery terminals will tell you for sure.
 
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