Electrical is not my strength.

Picked up a running ‘46 earlier this week, but the headlights don’t work. It seems the problem is at the voltage regulator.

Here is the wiring diagram- https://imgur.com/gallery/Dqhj7zL

Here is the wiring as it sits now - https://imgur.com/gallery/XVgcWGi

The voltage regulator has b, a, f, written on it. Do I just need to swap the red and yellow wires?

Thanks in advance