[ford38v8]

Assuming that you are running the original 6v positive ground system:

Go through all your electrical connections from battery on through and back to battery. Clean, grease and tighten all connections. Bullet connectors can be soldered, as they were only needed at assembly. For your headlights, use two relays, one for low beam, one for high beam. These are activated by your dimmer switch, and powered by a 10 ga wire directly from your solenoid, located up next to your horn relay, close to the radiator. Your dimmer then only activates the relays, which in turn powers the headlights. At the light buckets themselves, run dedicated ground wires from sockets to the frame. Check the sockets for voltage drop, you should have full battery voltage, as opposed to likely more than 1 v resistance from when you started. Use new silvered reflectors, and paint the buckets white inside. Use 50-32 bulbs (originals were 32-32). Clean the lenses in detergent, as they will have 70+years of smog deposits on the inside. That's as good as it gets, while providing the original look day and night. This system will rival any sealed beam up through the mid fifties. LED systems are looking promising these days, but not ready for prime time just yet. Stay away from halogens, far far away.