Headlights

I have a 2002 Toyota tundra sr5 4.7 l v8 extended cab and my headlights will not work I can get the running lights to function with the switch but not the headlights I have changed the headlight wiring harness fuse box under hood fuse box in cab and turn signal headlight switch and headlights still will not working! any ideas?

 

Halogen or LED bulbs? Fog lights on or off? Did anything on the truck change when this started happening?

 

Well, if you have LED lights, it would explain a lot. It's pretty well known these trucks have issues with the low resistance on LED lights, especially in earlier years. But normally it's the foglights and high beams that stop working when you retrofit LED headlights in without adding an inline resistor.

That said, could be a few things:

• Water intrusion has entered the in-dash wiring/fusebox and is shorting (semi-common problem)
• One of a few different fuses could be blown
• Headlight stalk is bad, it happens, especially if someone replaced it with shitty aftermarket parts in the past
• Headlight relay is shot (But I think there are separate relays for left/right, as there are also specific fuses for left/right so having both out would be weird)

That said, have you done anything prior to this that we need to know about? Like, anything around the steering wheel or column?

If you pull back on the stalk to engage high beams, and hold it back, does that work?

Do you have a cracked windshield, rusty windshield surround, or have you recently (past 2-3 years) had your windshield and/or windshield trims replaced?

Have you checked all the fuses, under the hood and in the dash? Under the hood, I think there's a 7.5A and a couple 10A mini fuses for the headlights, I believe it's in this group boxed in red below (this is the fusebox next to the battery)

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Well I bought the truck from a friend who owns a towing company the truck has been sitting for at least a year and he's the windshield is busted right above the dash board on passenger side I really don't know a lot about the truck except that when I bought it it started right up and I put it on a trailer and brought it home ! I then realized that the head light were these led lights that had fans on them but only worked on high beam so I went got new bulbs (halogen) the headlights would still not work on low beam after finding that all the light plugs had been cut except for the head light plugs and that the headlights were robing power direct from fuse box with a jumper wire I got a new second hand headlight wiring harness and under hood fuse box also got new inside fuse box and light stalk ! Now only thing I can control with the stalk are turn signals & running lights no head lights unless I put a ground to headlight and still it's not controlled by switch ?????

 

If you will post some good pictures of wires cut, head light plugs and anything that would help us better understand what you’re dealing with, it would be great help for those wishing to help.

 

If I read what you wrote correctly, it may just be the switch that's bad. I assume there's a way you can test that theory, by manually jumpering the wires. (Curious if @BubbaW has any input on that one)

And I only say that's my thought because that appears to be the only circuit impacted, the headlights. If there were other circuits, I would think it was potentially water intrusion.

EDIT: Hey hey, there he is! Awesome. Replied at the same time.

 

Double check your headlight relays and the ground strap to the fender by the battery.