fog light upgrade light's

2011 CHEVROLET AVALANCHE
158,621 MILES • 5.3L • 6 CYL • 2WD • AUTOMATIC
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ROYCAR71
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I'm upgrading to 5202 LED Fog Light Kit ironwall. The old halogen lights work, but when I replace with led lights they don't turn on. Do I need to upgrade relay in circuit?
Feb 20, 2021 at 1:31 AM
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STRAILER
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Nope, they should work. you can check for power and ground using this guide with the fog light wiring diagrams below to show you how the system works:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what happens.
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Feb 21, 2021 at 9:54 AM
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ROYCAR71
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Quick note. The wiring and fog lights are after market I installed. It came with 30 amp relay and 15 amp fuse. This setup works fine with regular halogen bulbs. But new led lights with fan in back they won't. Is that a sign that it's not getting enough power?
Feb 22, 2021 at 3:34 AM
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STRAILER
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It could be. let's check using a voltmeter. this guide can help us figure out what's going on:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please run down this guide and report back.
Feb 25, 2021 at 8:02 AM