Quandingyi Universal Wiring Harness 12V 40A Power Relay Blade Fuse ON/Off Switch for Off Road LED Work Light Bar …

I am a home 4x4 rebuilder as a hobby to help me destress and found myself doing this for my teenagers who where just starting to drive. I have used harnesses that come with high end lighting systems from PIAA, KC, Rigind Industires, and some more no name brands. These by far are the best I have purchased to date and for the price it is a great buy.PRO's:- Gauge of wire throughout. Looked like 16 guage mostly and maybe 18 or 20 for the switched connections. (larger than most of your others who run the smallest they can to support products depending on length of wire. This will handle any light out there, not just LEDs.- Duetch (weatherproof) connector attached and one for your device (Huge convenience and costly add on)- Rocker Switch versus cheep push button style (even though I use OTTRAW swithches)- Vinly Loom along entire line- Quality Relay- In line fuse with the ATO fuse- Terminal boots on the switch connectors. (Seems small, but shows the attention to detail and the sellers understanding of it all)- Doesn't double, triple S/H if you buy more than one- Quich ship and receipt- Overall price of the wiring harness (Fantastic for this level of quality)CONs:- Only one I can think of, offer with PRIME shippingLike I said above, this is one of many harnesses I have used and I bought two at first. Wish I would have purchased all he had left at the time. GREAT HARNESS. Get more out here (with Deutch) on Amazon soon PLEASE so I can buy a few more. Also I found your double end (two leg) version and I will buy a few of those as well.Thank you for putting together a high quality product that was at least assembled in the USA. (And you can tell)

So I'm a EE, and I knew what I was getting here.And it meet my expectations, cheap fuse holder, cheap relay that failed after a couple of cycles.But I really wanted the switch and the harness, which I only had to modify some length of wires a bit for the size of my truck.I have far better relays.The one that comes with this is not a standard Bosch layout, so had to cut in my own socket to go to a new relay.BE WARNED, if your not use to wiring, the instructions have a bad flaw... they show wiring the RED wire from the switch straight to the battery, and even give you a slotted ring lug for this, as they do on the fuse holder... and that other fuse holder should be the first hint.You never wire directly to the battery w/o going to a fuse as soon as possible.That RED wire from the switch needs a fuse if you wire it directly to the battery, and don't be tempted to wire it to the existing one in the harness, that one is too big for the gauge wire to the switch.I added a 5amp fuse and water tight fuse holder (and used my own water tight fuse holder with a 20amp fuse for the power lead from the battery to the relay, that powers the lights).OR, you can take that RED wire from the switch, and cut off the lug and tap into an ACCESSORY switched circuit that is fused and turns on/off with the key.The connector from the harness to the switch is nice enough, and should be in the car, not under the hood.I took a photo of the harness end of the connector, removed the pins, so I could easily pass them through the grommet in the firewall, and put the pins back into the connector shell once in the cab of the truck, and than connected the harness to the switch.I really just wanted the switch and harness and hoped for the best with the relay and switch.Relay failed, switch is working well.

By reading the other reviews I thought I would get some kind of wiring harness with the light, maybe a relay, a switch, or a fuse holder. The light has about 18" of rubber sheathed wire sticking out it's back, one red wire (+), and one black wire (-) protrude from sheathing. The little parts bag contained: 6 cap screws, 2 nuts, 2 rubber pads (for the feet), and 2 Allen wrenches. 2 mounting brackets (feet) are also provided (and they can be mounted with the feet pointing inward or outward). No other wiring was included. No paper work of any kind was in the box. I am an experienced mechanic so the install went smoothly, but if installation instructions were provided I think they would be of help to some buyer's. I installed the light thru a relay so it comes on with the high beams (thru a 10 amp fuse). The light is very bright and has a good range, now when I switch off the high beams (LED light goes off too) it is such a drastic change in lighting that it seems like all of my front lights just went out.

Seems quite simple. I would like more specific instructions. I had to do some extra reading to ensure I was wiring the system correctly the first time, as it were. Now, I SHOULD have purchased the heavy duty kit as I am running lots of lights on a bowfishing rig, but I didnt. I didnt assume they would use 18ga wire, but they did. So I partially reconstructed the kit to transfer in a larger gauge wire to carry more amps. I do not believe that 18ga wire is satisfactory for long-term use for LED light bars and high wattage lighting in general. Four stars for the gauging issue. I have not tested the system extensively. I just now got it completed and everything seems to work fine.

This was purchased for a light bar that didn't include a wiring harness. This made the light bar installation quick and easy. The wire was more than long enough to fit between the battery, light bar and cab.Hook up the red wires to the positive of the battery or a switched hot lead and the black wires to ground. The connectors go to the light bar and you can run two lights from the one harness. The relay helps protect the wiring in the cab.The only issue, and the reason I gave it 4 stars is the switch has an adhesive back that doesn't want to stick to any piece of dash plastic. At some point I will replace the switch with one that plugs into the dash