New fog lights will not light up

I just bought some new led fog lights for my 2013 Tundra, they are plug and play. The comments from other buyers say sometimes the polarity is marked wrong so I’ve tried flipping them to see if that does anything but I’ve had no luck. I contacted the manufacturer and they sent me another set, and I’ve gotten the exact same results. The only fuse I know of is in the fuse box under the hood. What could the issue be? Would the dimmer have any sort of effect? Relay somewhere I can check? Thanks for any help!

 

So they were working fine before? That seems odd that they’re not working now. I know the ones I just bought didn’t work and I flipped the plug around to reverse polarity around and they worked fine without any issues.

This may seem silly but you do have the foglight switch turned on correct?

Maybe @Jeff_5_7 can help, he seems to be a wiring/electrical guru around here

 

Do you have a voltmeter? Step 1) check to see if you are getting power. Step 2) plug in your old fogs and see if they’re lighting up.

 

The headlight switch must be turned on for the fog lights to work. I know its simple but make sure it is on.

One Fog light 15A fuse and a FOG relay that feed power to the front lights.

I would start by turning the truck on, turning on the headlights, then fog light switch and using a multimeter to check for voltage at the front fog light connector. Doing this will tell you if the problem is on the bulb side or the truck side.

Did you previously have working fog lights with older bulbs?

 

I'm having a similar issue. What do I set my multimeter to in order to check this?