Re: High output alternator
High output alternators are usually delta wound instead of wye wound in order to improve their higher amperage output, but higher current is achieved at the expense of low rpm voltage. Most manufactures will fit the alternator with a smaller diameter alternator pulley so the alternator does not fall below the cut-in voltage at idle but if it's right on the edge, you can get a "pulsing" of lights at idle. It's a function of the spacing between the rotor and stator and it's not harmful, just slightly annoying. If the pulsing stops when you increase the vehicle rpm's, and the voltage is normal, then the scenario likely as I've described and you can either live with it, swap to a smaller diameter pulley, or switch to a different alternator where the stator/rotor tolerance might be tighter.