If it were mine, I'd grab a regulator/rectifier off one of the Ebay scrap guys. If you have a multimeter we can check the alternator to see if it's burned out. Simply meter for resistance/continuity across each pair of the 3 yellow wires, if any results are >1ohm then it's junk. There are 3 wires so meter A/B, B/C, A/C. If your meter measures amperage, you can check the rectifier by metering draw from the positive battery post to the positive lead (lead disconnected) with the rectifier plugged up then unplugged. If you have a 500+ma draw that goes away when you unplug the rec. then it's bad. Is that clear as mud?