2000 access cab fog lights don’t work when running led headlights

Been trying to get my fog lights running now for months. took it to a few places after I gave up ,

bought some morimoto led head lights for about 200$ they work great plug and play , installed them While my front bumper was being powder coated. , had always been running cheap led in my fog light ,
When I put my bumper back in with my led fog lights I wasn’t getting ground to my fog lights I thought maybe we pinched a wire or wire got cut putting the bumper back on , checked grounds and fuses everywhere and relays , we jumped power to the switch and the fog lights would work

So what I found out is
After doing a bunch of research, I found that the headlights on your truck run reverse. 12V constant, ground when low beam or high beam triggered. Usually it is a ground constant, and individual 12V for low beam and high beam trigger.

The reason why the bulbs are interchangeable between other cars that have the normal system is normal halogen bulbs can run in reverse polarity, LED and HID bulbs can only run one way.

I also confirmed that your LED bulbs do indeed have a high beam capability. I can modify your wiring to get it to work with your LED’s and get your fog-lights to work ,

Showed my mechanic a wiring harness made for the LEDs headlights that I bought He then said
No, that one will just give higher power consumption headlights a stronger power since HID requires more power than LED. Your LED’s are low power.

Short story long is that the led headlights work great but don’t have hi beams functional yet and running led headlights took the ground away from my fog lights.
The mechanic then suggested maybe adding some resistors. But we have not tried that yet please give me some input beside getting rid of the leds haha

 

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You will need to add a resistor in order for the led headlights and fog lights to work properly. I ordered one for my truck off of superbrightleds.com and have not had any issues since installing it at the drivers side headlight.

 

I upgraded headlights and bumper driving lights with LED. I didn't add any resistors and everything works well. I disconnected the plug that automatically runs the headlights when the key is turned on. I can't remember why, but it was in a vid I watched... something to do with the Toyota OE light system running at a lower voltage depending on which light sequence is switched on. Sorry, I suck at wiring.... but mine worked first try.
Try disconnecting this - it's located along the inner fender next to your battery. I had to remove the battery to get to it. Worth a try.
2020-11-19_08-54-09 by GhostCreekMine, on Flickr

 

I think they "consume" less power... but still need 12V to operate at all. Most LED headlight 'bulbs' have a tiny built-in fan which needs 12V to spin. The LEDs in my headlights have these fans. The LEDs in my bumper fog light lenses came without tiny fans, just cooling fins. Maybe that has something to do with it?

 

2002 here. I installed Fogs LEDs first and then a few months later did the LEDs in head lamps. Something about having LED’s in Fogs first allows the Headlights LEDs to work properly per Headlight Revolutions.

Other option is install resistors which get hot and are fugly to look at.