High beam LED light bar

Hey guys,

I wired up a light bar last night to my truck and everything works except the function of it only coming on with the high beams. The light bar comes on with regular lights and stays on for the high beams. I thought tapping the fuse in the engine compartment labeled H-LP R-H would work. I thought this meant RIGHT HIGH but seems to function as the regular lights. It does however function the way I want if I turn of my lights and turn them on, the light bar will go on and off with the lights. Has anyone with this truck done this successfully? I can not find specific info for the 2005 tundra just other trucks. I used these videos.

https://www.youtube.com/watch?v=HQfEeblJ39U
https://www.youtube.com/watch?v=KK_R6Fd5s-4

I have started looking into taping the actual high beam wire instead of using a fuse tap in the fuse box. I also can not figure out which wire to tap into? I have the Haynes repair manual and I don't completely understand the wiring diagram. I will be testing the three wires coming out of the headlight soon.

I will add photos in an hour, gotta go shovel the driveway.

 

This is probably because the the daytime running lights on the Tundra are the high beams, at half power, and are always on if the truck is on.

Try disabling your DTRLs by disconnecting the grey two wire connector between the battery and the fender. That is the wire to the DTRLs resistor.

 

My end goal is to have the light bar come on with my brights only, when I push the switch in the cab for brights. If I disconnect the DTRL wire to the resistor will that achieve that goal or just turn off my DTRL?

 

Does anyone know which wire is for the high beams either in the cab inside the steering column or at the headlight itself? The wire colors from the drivers side headlight light are red-green, red-blue, and red-white

 

The red-blue would be the R-L in below pic since Toyota uses L to represent blue. That said, red-blue would be common(my words) and you could then determine high beams if you have volt ohm meter by checking voltage with highs on and measuring red-green or red-yellow.

 

I think so. Easy to try as it only takes a second to unplug the DTRLs.

I believe your issue is that the DTRL circuit is backfeeding your high beams, as its designed to do, which is also running your light bar.

 

I think I disconnected the wire you where talking about and it did not have the desired affect, thank you for the idea though.

 

BubbaW,
Thank you for that diagram, my maintenance book was confusing because I had no idea what color L could mean. I will test wires tomorrow. A common wire is a ground correct?
I am unsure once I find this wire if I will need a rectifier diode to keep anything from back flowing? Some resources online say yes some say no. Any thoughts?

 

hmmm, did it kill the DTRLs? (just making sure its the right plug. I don't remember it being anywhere near the washer reservoir.

This is mine:

 

It will turn off power to a small bulb in the main headlight housing. There is no wire on the side wall like it your truck.

 

I use the light circuit in the fuse box to trigger mine. If my light bar is on I have no need for high beams. Light bar overrides them. Are you trying to set it up to use with high beams on the road? I only use mine offroad. Not legal on public roads.

 

Interesting, must be a difference between years.

 

Possibly a bad choice of word on my part but what I am meaning is R-L is sitting there with 12VAC waiting to go thru either the High Beam filament or Lo Beam Filament. If you follow R-L upwards on schematic and make left turn, then thru the contacts of the Headlamp relay(H-LP), it leads to the positive terminal of Battery.

 

05 and 06 does have the extra running light bulb in the inside corner of the housing. Not sure if that's serving some purpose for drl or not. I had assumed it was for drl, but if the headlights still come on then I'm lost. Here's a picture of mine showing the little extra bulb on the corner of the light. Mine is white, but it's usually amber.

 

SOLVED! Red-Green wire is the high beam. Taped into that and it works. Thanks guys