First thing to do before you start throwing money and parts at it is to do a bit of troubleshooting. Unplug the VR and see if the voltage drops. If not you likely have the green field wire brush or wire shorted to ground, causing "full charge."
Have you done anything lately that might have moved/ caused a short in the harness? Replaced the alternator?
With the VR plugged in, it varies between 15-17VDC. When I unplug it, it quickly drops from around 13.5 to 12.5 and then slowly drops from there. I didn't do anything with the wiring or harness or alternator.
The reason I replaced the VR was that after I installed all new gauges which included a voltmeter, I noticed on the first drive that my voltage was dropping and so i drove home quickly and when I got in the garage it was around 7v and the engine quit. I had been charging it between drives up to that point cause I thought it wasn't being driven enough but having the gauge showed me that it wasn't charging. Also, when I removed the original, the back of it was overheated and liquid solder had almost worked its way to the surface. The replacement VR fixed the problem (not for long) and now it is the opposite issue in that it seems to be overcharging.
