"Pulsing" voltage, RPM drop with load.

Make sure the ground on your regulator is good. Scrape the paint on the firewall where the bolts go through. Also you can also get a adjustable regulator on eBay for around $15.00 and this will allow you to set your charging voltage. I have mine set to run at a max voltage output of 14.5 volts at speed and it sets at about 13.4 volts at idle.