too much voltage after adding headlight relays

I really have a hard time following verbal connections on a car I cannot see. A schematic is worth 1000 words. The intent of adding the relay is to power pin 30 from battery, and I assume #12 gauge wire will minimize voltage drop. Then pin 87 should power directly, to regulator, ignition coil (blue)feed via ballast and field. The ignition blue that used to power all that, is cut free, and powers pin only pin 86, relay coil. When I write directly on pin 87, that means do not do that under dash, do it under hood. That way it does not go thru the bulkhead connector. On an early car it is easy, it can be done without a cut, by pulling connectors from ballast, and regulator, use one to supply pin 86, then make new wiring to regulator, and ballast fed from 87. I am not sure on newer car, with different regulator system. Others like Del, crackedback may know best way to directly splice in to later regulator circuit wiring.

The field current should only be 3 to 5 amps. If it is greater than that, there is likely a shorted turn in the field. Time to get alternator tested. It the field is nornal, the existing wiring, and or bulkhead connections are poor, resulting in the 2V drop. The suggested wiring gets around that on the pin 87 feed you wire under hood.

While this may get the car to run and charge, there are likely other bulkhead connections that need to be repaired. If the ignition one gets much worse, it may even fail to power the relay coil that is only about 0.1A.