I restored this car back in 1997 and rewired the connectors to the voltage regulator because squirrels had chewed the plug off. Everything had been fine since then until last month I started having issues. I checked the voltage charge of my battery while the car was running with first a battery tester then a multi meter. It was fluctuating between 12v and 15v, so I checked the voltage regulator connectors and there was one frayed wire and some corrosion. I bought a new voltage regulator and a new plug, when I finished installing them the charge was no longer fluctuating but it was overcharging at 18v. I plugged up the original regulator and it was also overcharging at 18v. I read somewhere that the voltage regulator has to be grounded to the body so I bought new bolts and ran a ground wire off one of the bolts to the shock tower bolt to ground it. I cranked the car up and it is still overcharging at 17v, even after it idles down, or when I rev up the engine. I'm not sure if one of the plug wires for the regulator had to be ground or just the body, any help would be appreciated