You can buy
H4 headlight relay harness off eBay for $45 bucks and Octane also sell good conversion kit.
For me, I went way more complex and highend. It all started when I realized the headlight were only 9 volts going to the headlights. I found 12 volts at the bulk head and 12 volts at the core support, but after that the headlight harness was complete junk. My solution was to use the existing harness to a plug near the core support, then a plug to a proper relay box, then new wires from the relay box to the head lights. I used
these plugs to terminate the wiring at the head lights and
GLX 12ga wires.
I went with an
American Autowire Severe-Duty Relay Panel. It's a rebadged
Eaton 8 gang relay panel. The kit includes high quality GXL wires and lots of fancy Metri-Pack 280 connectors. I priced it out and the American wiring kit was cheaper than ordering everything from WayTek, so I bought the kit. The panel is mounted inside of the left fender in front of the wheel. I have easy access to the box fuses and relays if I turn the wheel hard right. Anything more serious requires removing the wheel.
There was an big issue to overcome with my plan. The relay box is ground triggered and the highlight delivers 12v to the headlight via the switch. To correct this, I converted the highlights to ground trigger by cutting the headlight feed wire, making that into a ground, which reversed the circuit. For the bright light indicator bulb, I tapped into the 12v feed to the instrument panel then reverse the circuit so it gets ground from where it use to get power. I used
this socket to connect the bulb as the old bulb got ground from the panel. Everything is reversible back to stock because I used 15 amp 12ga bullet connectors at all the splices. And depending how you look at it, the good thing is I can't leave my headlights on because the relay box is triggered by the key-on ignition. Or bad thing that I have to have the key on to turn on the headlights, but when has anyone intentional left the headlights on with the key off?
For the headlights housing, I went two
Hella H4 kits for both high and low beam. The housing are all glass, direct replacement for sealed beam using standard H4 bulbs which uses the same plug as sealed beamed units. They look 100% stock from the front, but preform much better. The kit is not DOT approved; it's the European equivalent. The different is DOT low beam lights project a flat beam. The European low beams are flat on the left side and angle up at 30 degrees on the right to light up the side of the road better. They are much better than DOT lights in my not-so humble opinion. I did have to modify the lamp buckets by opening the hole to 3-1/2", but the locating tabs are in the correct locations.