On my 1954 Chev I just converted to 12V and gutted the regulator box to mount 3 relays - Low beams, high beams, and horn.

Since I want to be able to turn on head lights anytime, power will come from my new fuse box which is powered from the + side of the ammeter and will
show discharge when the lights are on and the engine is not running.

I bought pre-wired relays on Amazon.

Headlights : The 6012 is 50/40 watts High/low beam.
The 6014 is 60/50 watts high/low beam. 
The 6012 is difficult to find any more. The 6014 was used as a replacement for the 6012 over the years and can still be found. Mostly on eBay and Amazon. 

The H6024 is the Halogen replacement for the 6014 and is rated at 65/35 watts. 
Attachments
20190210_161706.jpg (131.88 KB, 159 downloads)
relays
20190214_152851.jpg (173.95 KB, 158 downloads)

1954 Chev 3100 Truck - Mostly all "Original"
https://lh3.googleusercontent.com/4...7X26uneH2rb3222fNY4s7FvnKH=w1697-h954-no