I installed a pair of H4 headlights on my Barracuda ran off relays. 90watt low beams/100watt highs makes for some serious lighting over stock. I purchased these off ebay for for about $24 shipped with bulbs. Awesome deal and I would do it again in a heartbeat. The lenses are glass. No complaints

Bulbs are very bright, direct replacement for stockers, and use the factory wiring if need be. I decided to make a new headlight harness off of relays rather than try and get high power lighting out of 30 year old wiring. Which is not only not very effective, but also could be dangerous. Here is the harness I made, nothing fancy. Just measured and spliced. All 12 gauge wire with brand new painless wiring headlight sockets. All soldered and weather tight, wrapped. Rather than hacking my factory wiring, I just installed this harness, the factory sockets are still there and functional if you decide to go back at some point.

I used Painless Wiring part number #80300 sockets. They are around $15 or so.

That is basically it for the relays-out harness for the headlights. The sockets are the exact same as the factory ones, so to find which terminal on the headlights is for the high beam and low beam. Simply just turn on your high and low beams, using a test light see which terminal is hot when and that will let you see which terminal on the headlight should be hot for high and low beams. They are not both hot when on high. To wire up the relays here is a basic diagram of what wires go where on your four-post relays. I ran, I believe 15amp fuses to a mini fuse box I bought off Checker Auto's website. Anyway here is the diagram.

To connect your 'Tigger' wires to the factory wiring you can either use male spade connectors and plug them into the factory socket. Or, what I choose, was just Tap Splices. These wires are low current, which means that the load of the headlights do not pass through them. It just tells the relay when it should give power to the 'output'. As in when the headlight high/low switch is on. I used tap-splices for that. That is all that is needed to be done to the factory wiring harness. Easily removed if need be, will not 'hack' into your stock wiring.

Any questions, recommendations, additions to please email Mike@GoodysGotaCuda.com

Low Beams

High Beams