Quote:
Originally Posted by sun tortise
With the headlights on, and fully charged battery, the voltage rises only a few tenths above the battery voltage when the engine is revved. When i changed the voltage regulator, the new one had longer brushes (less wear) and there was a slight groove on the armature where the brushes ride. Belts are tight.
The odd thing is how the battery light, which glows dimly at idle, gets quite bright when the engine is revved.
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Odd, yes, but not mysterious.
Your alternator is not making nearly enough current. You should be in the ballpark of 13.8v+
If you’re confident your replacement brushes are of good quality and your grounds are all clean of corrosion, then it sounds like your alternator needs replacing due to an internal fault (could be diode, could be in the windings, not my area…).