Ordered 3 harnesses! Tested each one before install and all 3 get constant power without the toggle switches even connected?? Relay issues??

I really don't think it would be a relay issue. I don't think 3 would be bad but you never know. I've got 2 of the same ones and didn't have any issues. Are you sure you aren't giving constant power to it? Not being sarcastic but check your wiring I don't see how 3 could be bad

Is it possible to buy a replacement switch for this harness?

I am sure you can replace the switch, it a common switch found at most auto parts retailers, average price $5. just a 3blade switch.

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Nilight - NI -WA 06 LED Light Bar Wiring Harness Kit - 2 Leads 12V On Off Switch Power Relay Blade Fuse for Off Road Lights LED Work Light, 2 Years Warranty

Nilight - NI -WA 06 LED Light Bar Wiring Harness Kit - 2 Leads 12V On Off Switch Power Relay Blade Fuse for Off Road Lights LED Work Light, 2 Years Warranty

Product ID: 240277645

Details

Brand
Nilight
Connector type
rings
Item dimensions L x W x H
17.8 x 2.5 x
Item weight
45 g
Material
Aluminium

📏10 feet length for versatile mounting

🔌12V 40A power relay

🛡️Inline blade fuse for safety

Description

⚡ Power your off-road adventures with confidence and style!

EXTENDED REACH - 10-foot wiring length lets you mount lights anywhere on your rig
BUILT IN SAFETY - 40A relay and inline fuse protect your setup from electrical faults
DUAL LIGHT OUTPUTS - Two leads to power multiple LED light bars simultaneously
UNIVERSAL COMPATIBILITY - Fits all 12V vehicles, boats & devices—plug and play convenience
HASSLE FREE INSTALLATION - Includes clear instructions for quick, professional-grade wiring

The Nilight NI-WA 06 Wiring Harness Kit is a robust, universal 12V solution designed to power dual LED light bars with a 40A relay and inline blade fuse for enhanced safety. Its 10-foot length offers flexible mounting options across vehicles and boats, backed by a 2-year warranty for reliable off-road lighting performance.

Specifications

ASIN	B071ZPX32N
Best Sellers Rank	234,476 in Automotive ( See Top 100 in Automotive ) 1,046 in Car Relays
Brand	Nilight
Cable Type	Proprietary
Connector Type	rings
Customer Reviews	4.6 4.6 out of 5 stars (30,616)
EU Spare Part Availability Duration	2 Years
Global Trade Identification Number	00600537016507
Included Components	1PC Wiring Harness Kit
Item Dimensions	17.8 x 2.5 x 5.1 centimetres
Item Type Name	Nilight LED Light Bar Wiring Harness Kit - 2 Leads 12V On Off Switch Power Relay Blade Fuse for Off Road Lights LED Work Light,2 years Warranty
Item Weight	45 g
Manufacturer	Nilight
Manufacturer Part Number	NI -WA 06
Material	Aluminium
Model Number	10008W
Number of Items	1
UPC	600537016507
Unit Count	1 Count
Wire Diameter	1.63 Millimetres

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