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3 wire led brake and turn light wiring


scruffy

Member
Joined
Jun 22, 2024
Messages
9
City
Ky
Vehicle Year
1994
Transmission
Automatic
Hey guys viewed lots of posts here learned a lot this is my first post. I'm needing some help figuring out a wiring scheme for two 3 wire led brake/turn signal lights. Ive removed the factory brake light wiring harness and bed and have a trailer light harness that came with truck, its old looking but I figured it may work. it has 4 wires green yellow brown white and my LEDs have white-ground black-tail and red-stop/turn. Ive looked up many diagrams and videos I think I hooked it up right so im wondering if my harness box is bad? when i hook up to the green wire i aint getting no light and when i hook up red from led to yellow on harness i get brake and turn but when i put turn on the left the right side barely blinks when it should be off any diagram would help alot ill post some pics of what im working with
 
Having a heck of a time uploading photos lol
 
Pics won't upload basically I hooked up led reds to yellow and green on harness -left and right turn signal ,and I hooked up white grounds and I hooked up black from LEDs to brown in harness I've got right turn sig working but right side barely blinks when i hit left turn sig and brakes ain't working help needed greatly apreciated
 
Hey guys viewed lots of posts here learned a lot this is my first post. I'm needing some help figuring out a wiring scheme for two 3 wire led brake/turn signal lights. Ive removed the factory brake light wiring harness and bed and have a trailer light harness that came with truck, its old looking but I figured it may work. it has 4 wires green yellow brown white and my LEDs have white-ground black-tail and red-stop/turn. Ive looked up many diagrams and videos I think I hooked it up right so im wondering if my harness box is bad? when i hook up to the green wire i aint getting no light and when i hook up red from led to yellow on harness i get brake and turn but when i put turn on the left the right side barely blinks when it should be off any diagram would help alot ill post some pics of what im working with

I can't help with the light side but this PDF for the trailer wire harness side might help.
 

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Easiest way I've found to do pictures here is Imgur. Once you upload a picture, you can go to your account and click on it to copy the bbcode to paste into your post.

One side being affected by the other is usually a weak ground. LED would be more sensitive to that than factory bulbs.
 
Appreciate the help. I think from that diagram from sgtsandman I have my lights wired like that and like senornoob said it could be a ground. im thinking of testing harness tomorrow with multimeter to make Shure its good still not Shure why left sig aint giving me nothing guess we'll see. And I'll try to figure out the pic posting to
 
Ok so been working last few days I've did some testing with multi meter noticed when I connected to yellow right turn wire in harness and hit turn sig it flashed from ruffly 10 to zero in time with turn signal click and when I connected to green left turn wire in harness it was doing a mixture of numbers unlike the yellow wire which i assume should be the same as yellow since there both turn wires is that a good sign my box is bad? I wired lights just like diagram as far as I know what you guys think? Moneys tight hate to buy a 59 doller box if it's my wiring lol yet ng to narrow down the issue and at some point I'll be putting bed back on and using factory lights so I need these LEDs to get me by until I get bed back on got it off to fix a few things till I get them I'm going bedless
 
Here's a pic of led lights IMG_20240622_193215794.jpg
 
Here's the truck really digging the ranger club great truck just needs work 0f4e3d07-718d-4c8a-b3f5-eebf13f3cdeb.jpg
 

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