- [ALL STAR TRUCK PARTS] 4-Headlight Relay Wiring Harness H4 Headlamp Light Bulb Ceramic Socket Plugs Set

This harness enables your headlights to run directly off the battery. The harness just plugs into your existing headlight socket so your headlight switch still operates the headlights. The new harness has two wires that go to the battery and four ground wires, very simple. Take a picture of your headlights before and after, you will be amazed at the difference.

Needed to upgrade 32yr old headlamps on a Grand National. The price is great, the speed of delivery is pretty good. The product is okay but not as plug and play as stated. You will want some automotive electrical experience since not wired correctly at plugs for bulbs. You will need to research your headlamps wiring and verify pins. I had to swap all terminals around to get lamps to function properly and not feed back in system. Also, relays are different ratings and needed to swap after correcting connections in plugs. The lamps would cut off after 30 seconds with high beams on, it was over powering the weaker relay installed in the wrong spot. After fixing these issues works good. Not a show quality harness. But, as a daily driver and use item I am please. Just research your wiring for car and be patient. It will work.

This was a retrofit for a 4th Gen firebird, using h1 and 9005 projectors. Plugs didn't matter since I would be changing them anyway. The wiring actually feels decent, no idea if it's OFC or AL clad. the relays seem decent. I ran a 3A diode on pins 87 to keep my low beams at the same time as my projector high beams, works great so far.

Easy install. Fixed my vans overheating headlight switch problem with high power headlights.

The product offers a user-friendly setup and installation process, albeit requiring a moderate level of technical aptitude. A minor issue was encountered; one wire within the kit needed to be cut. This was necessary to rectify a pre-existing wiring problem in my vehicle, specifically a malfunctioning high beam indicator. While the wiring in the kit appeared robust, the internal conductor within the cut wire was noticeably smaller in gauge than expected. The installation is complete and operational; however, the long-term performance and heat dissipation capabilities of the thinner conductors remain to be observed.

Harness is great so far, but time will tell. I installed this yesterday on 1962 Ford Thunderbird. A little surprised it came with zero instructions, but did a quick You Tube search for a tutorial for installation. I had installed halogen receptacles & bulbs for 4 headlights, but had some trouble with lights going off while on bright. Realized I needed this relay so increased amps would not be going through headlight switch & dimmer switch on floor. After installation I realized it had probably damaged $9 dimmer switch on floor, so replaced that too. So far headlight switch is working normally.

I would not recommend this product. I ordered it for my 71 GMC. Pictures look good but it feels very thin. I went ahead and installed it and got bright lights all the time. I traced down the instructions and it was installed as they showed. I removed it from the truck and was studying it and realized that one of the plugs is wired wrong from the manufacturer. I’m not reinstalling it. If it shipped from the factory with a Tested good sticker on it and it’s actually wired wrong, I don’t think I can trust the quality.

Looks like a great product haven’t had any time to get it installed heavy gauge wiring and nice connections should serve its purpose

Wires are very thin, the harness overall is flimsy. The entire harness stopped working after the first week. This thing isn’t even worth the price. Sent emails to the company and no response. Stay away from this garbage.

I used it to wire a Dodge Coronet LED headlight system. The ceramic plugs are a little brittle. Also, I wish they had wired in the low beam so both lights could come on. If the customer needs to delete it, they just cut the wire.

Decent product but the wires are in the wrong position on the inlet plug.

Great product but found that some of the Ceramic was very brittle chipped easily

This will probably be sufficient for most people, but for me, I needed all four sockets to be hi beam compatible and they aren't. One is hi/low beam and the other is just low in each pair, and there is no way to really change that due to how the connectors are done in the socket. The quality of the sockets also seemed a little iffy. Probably fine but I just didn't get a warm and cuddly off them so since I needed all 4 hi/low ended up getting new sockets, cutting the old ones off and wiring the new ones on in full hi/low. All good now.