too much voltage after adding headlight relays

Whoa.....! It sounds like the ballast is drawing normal current. DON'T toss your ballast in case it is an original one! The parts stores will give you a wrong replacement most of the time.

The voltage regulator and the ballast draw current from the same source: The ignition switch, through the blue wire. You probably have a high resistance connection between the ignition switch and the VR and ballast. So back up.

The blue wire does not come from the instrument cluster connecotr. It comes from the ignition switch through a connector on/under the steering column. It then passes through the bulkhead