4 Headlight mod (99-02 only)
This modification is possible on most years. Basically, the way stock headlights work is when you click on the high beams, the low beams click off. Like this:
Low beam:
Yellow wire – at resting state “off” is 12V+, drops to ground when turned “on”
Orange wire – remains at 12V+ constantly
High beam:
Purple wire – at rest “off” is 12V+, drops to ground when turned “on”
Orange wire – remains at 12V+ constantly
I live out in the country and having the ability to have all four lights on in the “high” mode would be awesome. All too often I see deer just dying to throw themselves at my truck. If I could light up a lonely road, maybe I could anticipate it better.
I googled how to do this on my truck and this is what I found out.
1. Open hood
2. Remove brace from firewall to Driver’s side fender.
3. Remove top of Circuit panel.
4. Unhook the snaps from the passenger and drivers side of the cover.
5. Roll entire circuit board over towards the passenger side.
6. Locate the Grey connector. (There is only one)
7. At location D3 (3rd down 4th to the right) is a light gauge yellow wire. It is the only yellow wire in this row.
8. Tap this wire and ground it to the Light ground on the firewall. Follow the lead from the Hood mounted light, and you will find it …just to the left of the Master Cylinder.
9. Put your stuff back together.
I found the information here:
Quad Headlights Mod
This sounds simple enough. While I have the headlight assemblies out for the Euro upgrade, I plan on making this mod.
My European headlight parts finally arrived! (Plus some other parts too!)
I ordered all the parts I needed to complete the swap over to the European adjustable headlights. Earlier I had came across a fella that was selling the headlight assemblies, brackets, and motors.
I did some research, (really tough research) and found all the missing part numbers I needed to swap for a factory style setup. Since I was ordering factory parts from the general, I decided that I would go ahead and order some of the things I needed to swap in the 4L80E and NP149.
I had actually ran into a problem that I hadn’t even considered. When my list was complete with all the obscure part numbers I needed, I tried to order the parts online. The first place I tried cancelled my order because I didn’t have the correct VIN number.
Apparently you’re not supposed to order these parts unless you actually have a European vehicle. I don’t see why it would be a problem. Maybe it’s a liability thing?
So I tried ordering the parts from a different online seller. We went a few rounds, but they finally sent me the correct parts after I told them that I was 100% sure the part numbers were correct. They told me that with the European parts, I would not be able to return them.
So I’m not sure if I got lucky and got my parts, or if there is a rule that GM will not sell overseas parts for domestic vehicles. I also looked into the legality of the headlights and Oregon recommends them.
Below are the pictures of the parts I ordered.
First up, here’s a pic of the pocket that goes where the push button 4WD selectors are. I’ll be removing the buttons because I’m putting in the AWD transfer case, it’s complete automatic in nature.
European Headlights
I hate European headlights/taillights on domestic vehicles. The aftermarket “Euro” headlights always look cheap and plasticy to me.
So when I came across a set of actual European headlights I had to have them. To be quite honest, I didn’t even know they existed.
Here’s what I found out.
First off I asked the seller how he even found these lights and this is what he said:
I saw a thread on another forum years ago where a guy stationed in Germany had spotted an export Tahoe. GM had modified trucks to meet European standards which included different headlights, side markers and exhaust tail pipes that went straight out the rear instead of the side.
Project "Charlie Murphy" 