Well, I've tried the obvious. I grounded the Voltage Regulator on to the block and cleaned up all the connections, Including the body ground. I even added a ground from the alternator body to the frame. Any other suggestions? The car fires right up and runs great, but when I rev the gas, it pegs out at 18 volts.

Let me just say this now, wiring is not my thing , so I may have missed something obvious... It's a 440 Cuda with Electronic Ignition, after-market A/C, autometer gauges (no ammeter). My voltage always fluctuated, but didn't become a problem before I put this late model alternator in it...

As always, I appreciate you guys. You always seem to get me out of a rut