#3,126 in Automotive
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Reddit mentions of Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack，2 Years Warranty
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Reddit mentions: 1
We found 1 Reddit mentions of Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT with Interlocking Relay Socket and Wiring Harness-5 Pack，2 Years Warranty. Here are the top ones.
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High switching capability: normally open 40A/14V DC and normally close 30A/14V DC. Suitable for Nilight LED light bar wiring harness kitPremium quality: durable relay and harness socket with 5 wires; made by high-grade materials to ensure superior quality and long lifespanMale-female slot design: unique male-female slot design, easy to connect the relay with harness socket, clean and neat after installationEasy wiring: the relay sockets come with different colors for loads/accessories, simple and convenient wiringPackage include: 5 x relay and 5 x relay socket with wiresFit Type: Universal Fit
Specs:
| Height | 5 Inches |
| Length | 5 Inches |
| Number of items | 1 |
| Release date | August 2017 |
| Size | 5 Pack Relay and Wiring Harness |
| Weight | 0.5 Pounds |
| Width | 2 Inches |
So that thing has 40 bulbs, are they 3W bulbs? If so, you're adding 10 amps worth of draw.
This will be your best bet, the only difference is instead of wiring in the included switch, you'll wire the switched wires to the headlight circuit.
If you don't want to buy the kit, go ahead and buy a relay and harness pack, then wire the black wire to ground, yellow to the positive wire on light bar, the white wire to the headlight positive circuit (your switch), then the blue wire with an inline fuse of at least 15 amps direct to the battery. To handle that amount of power, I'd recommend using 14 gauge wire, I tend to go a little heavier on wire than most, but I like the safety factor.
edit: also make sure you heatshrink the connections for weather protection, and use either good butt connectors or solder the connections.