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

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.

It does what it says. Couple things could make it better. Had to change the pin outs on three plugs to get it to work correctly. It would be helpful to have a diagram in the instructions for how the plugs are wired to check against factory. Also the power lead could be longer.

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.

This worked great on our bus rewire.

Relays don’t work unless smacked or jolted, lights turn on and off when hitting a bump. Total safety hazard. Wires are thin gauge, insulation thickness makes it seem like they are a heavy gauge. I Made direct to battery connections and even the main power lead is thin. Bought to save time vs building a harness and sourcing parts, now I’m doing the job twice and having to build my own. Don’t waste your money.Also why put a “pass” label on the harness but have no quality control on the relays?

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.

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.

Only giving it 3 stars because I’m pretty sure one relay came in busted. As you can see in the photo one is lit and the other is not. According to the direction one relay for high beams one for low beams. I have the same problem as most did. High beams on all the time. This is for a 1985 Nissan 720 pickup. I tried to re-pin the connectors at the bulb and at the “ low beam plug “ nothing worked. So my next best guess is that the relay is not working properly or at all. So I’m buying another one to test the relays make sure they work properly. You can see in the photo one is lit and the other is not. So we will see. It won’t let me exchange it so…

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.

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.

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