This is for adding headlight relays only and keeping everything else stock. There's a bit of discussion from time to time regarding lighting upgrades. This is a cheap ($25-ish) and easy DIY for those who want to get full voltage to their existing headlights. I don't see any reason one couldn't upgrade to better bulbs/lights after doing this? I personally don't drive at night often enough to have worried about it, but after a little reading I see why the benefits outweigh doing nothing. At the minimum, it will protect the switch and the small stock gauge wires from overheating/failure (Yet...My Jeep's switch/wires are stock and 46 years old). Ok...I admit it...I just like doing stuff to my Jeep. I was curious to see how much voltage was being lost through the Jeep's electrical system. I used a volt meter set to volts. I put the negative lead on the main chassis ground and the positive on the Jeep's lighting bus bar on the driver's side fender. All tests were performed with the Jeep off and just the headlights on. Battery reading - 12.73V Low beam = Black wire at bus bar. High beam = Red wire at buss bar. Before relays: Low beam = 10.70V High beam = 10.0V After: Low beam = 12.15V High beam = 11.85V Parts used... I had all this on hand, but here's a itemized list: 1 - 4 Pin 30AMP 12V relay for Low Beam (you can use a 5 pin, exclude 87a). 1 - 4 Pin 30AMP 12V relay for High Beam. 8' - 10 gauge wire (Red power). 8' - 10 gauge wire (Black ground). 1 - 30AMP blade fuse/holder. Assorted spade connectors and splitters and miscellaneous 12 gauge wire for extensions. I found that the wires coming directly from the headlights were 12-14 gauge...So I kept them intact except for new spade connectors. I soldered all the connections with the exception of one female bullet connector, I crimped it. Disconnect your battery or battery disconnect switch. Here's the stock lighting bus bar...We're focused on the 2 far right lugs. They get their power directly from the headlight switch. Black (far right) is the Low Beam power source. Red is the High Beam power source. We're going to use and add length approx. 6" to these existing wires (later) to activate the each relay (pins 86). Remove the stock lighting block. Take the 2 light blue wires and strip one longer than the other. The yellow and blue wires with the brown plug will remain untouched as will the single black wire with black plug. Add a connector of your choice. Free up the harness routed to the passenger side headlight. Remove the stock wire rings and add the appropriate connectors. Black is low beam (LB relay pin 87) and red is high beam (HB relay pin 87). The female bullet connector goes to the male end already soldered in the previous pic. The 4th wire/plug remains untouched. Replace the wire rings on the driver's side with new connectors. Black is low beam (LB relay pin 87) and red is high beam (HB relay pin 87). Wait Focker...How are you going to connect 2 spade terminal connectors to one relay pin? That's coming. Space the relays far enough apart in order to use the existing holes that the stock lighting bus bar used. I'm using the left relay for LB and the right for HB. Connect a 10 gauge grounding wire jumped from pin 85 to 85 on each relay. Notice the dual spade connector I added? Add another dual spade connector to terminal 30 on the same relay. Make another short 10 gauge wire (red/pwr) jumping pins 30 on both relays. Plan your 30 AMP fused power...I went straight to the battery with 10 gauge wire and to the main chassis for ground. These wires run directly to the relays, pins 30 (power) and 85 (ground) on the HB relay. There's no particular reason I did this other than...That's how it ended up. Clean it up...I made a small bracket that this particular fuse holder had a groove for. Route the power and ground wires to the stock lighting bus bar location, mount the relays and connect it all. Once the relays were mounted I could determine how long the stock low beam and high beam extensions needed to be. High Beam Relay (DSC = Dual Spade Connectors) Pin 30 DSC = Power (red) from battery and jumped to LB relay. Pin 85 DSC = Ground (blk) from chassis ground and jumped to LB relay. Pin 86 = Stock HB source (red) stock wire extended 6". Pin 87 DSC = Stock HB wires (red) direct to headlights. Low Beam Relay (DSC = Dual Spade Connectors) Pin 30 = Power (red) jumped from HB relay. Pin 85 = Ground (blk) jumped from HB relay. Pin 86 = Stock LB source (blk) stock wire extended 6". Pin 87 DSC = Stock LB wires (blk) direct to headlights. The lower mounted relay is the Low Beam relay and the higher mounted relay is the High Beam. It's kind of jumbled, but I like it in the stock location. I'm personally not concerned about the exposed relay terminals. I added dialectic grease (not pictured). Passenger side cleaned up.