What wiring harness do i need for the nilight 18024c-a 420w 20inch triple row flood spot combo 42000lm bar? i have one for 120w but the bar is 420w?

First, for what its worth, this unit does not provide 420 watts of lighting, it is closer to 200. However, if it did use 420 watts, it would draw a tiny bit over 30 amps when your vehicle was running (13.8VDC is the "normal" voltage your alternator will provide). If your vehicle was turned off, it's battery voltage would probably be around 12.5VDC at first, and then it would draw around 33.5 amps. Long answer, but if you use 10 gauge wire with this unit you will be fine. I am actually using much smaller wire on mine with no issues, but am a bit scared to recommend someone else doing so (I am using 14 gauge as my unit is only pulling 15 amps). By the way, Watts divided by voltage will give you the amperage on a DC system for most applications).

Does the Nilight 18024C-A come with a wire harness and switch?

No. If you scroll down to the things bought together you should see this ... Nilight - NI -WA 06 LED Light Bar Wiring Harness Kit

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🚀 Light up your adventure — see what others can’t!

CUSTOMIZABLE FIT - Adjustable and sliding mounting bracket lets you fine-tune your light bar’s position effortlessly for perfect beam alignment.
UNMATCHED BRIGHTNESS - 420W triple row combo beam delivers a staggering 42,000 lumens for ultimate visibility in any terrain.
LONG LASTING DURABILITY - Die-cast aluminum alloy housing and high-quality LED chips guarantee over 30,000 hours of rugged off-road illumination.
PRECISION LIGHTING CONTROL - Triple row with nest reflector cup and broad reflective plates optimize multi-angle ambient illumination.
BUILT TO BRAVE THE ELEMENTS - IP67-rated waterproof, dustproof, and anti-corrosive housing ensures relentless performance rain or shine.

The Nilight 18024C-A is a 20-inch, 420W triple row LED light bar designed for off-road and marine use. Featuring a combo flood and spot beam with advanced reflector technology, it delivers 42,000 lumens of pure white light (6000K-6500K). Built tough with IP67 waterproof rating and die-cast aluminum housing, it offers over 30,000 hours of reliable performance. Adjustable mounting brackets provide flexible installation on trucks, boats, and more.

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Manufacturer	Nilight
Brand	Nilight
Model	18024C-A
Product Dimensions	50.8 x 7.62 x 7.62 cm; 1.57 kg
Item model number	18024C-A
Exterior	Painted
Manufacturer part number	18024C-A
Position	Centre
Bulb type	Led
Voltage	12 Volts
Item Weight	1.57 kg

Nilight 18024C-A 420W 20 Inch Triple Row Flood Spot Combo 42000LM Bar Driving Boat Led Off Road Lights for Trucks, White

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