Alternator Pulsing

An electronics engineer who designs voltage regulators told me that sometimes the alternator ripple frequency and regulator operating frequency can get close to each other and will cause voltage fluctuations. Electrosystems has changed the operating frequency of their regulators to 1000hz. to eliminate this problem. The bad news is, their regulators are certified for aircraft use and cost well over $100 dollars. I don't know if any other manufacturer has done this. I would try a different regulator and also find someone who checks alternators with an oscilloscope and see what the ripple pattern actually is and if all the diodes are carrying their share of the load.