boy do I have a doozy for ya...

Is it coming from Voltage Reg or the ECU. ECU has thick jelly-like **** in em. i would say in either case that it is shot, which would explain 18V

it's coming from the box right next the alternator with the wires that plug into the alt.

also, why didn't it act up when I opened the choke? was this a combination of problems?