How-To: 4 High Headlight Mod For Free 99-02 GMT800.

[3500in nc]

Ok here we go figured id post this here so info can be shared and ppl can save money

 

Take the headlights out of the truck then snip the yellow wires that come right out of the low beam bulbs, leave enough room to crimp a butt connector. then run the new wire to any available nearby bolt to ground the wire. it was super easy.

 

 

i could take pics of the wiring in the engine bay if you would like just PM me

[OCTO13ER]

Does this run the DRL's, brights and low beams? That simple, huh?

Thanks for the post!!

[3500in nc]

Does this run the DRL's, brights and low beams?  That simple, huh?

Thanks for the post!!

 

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na i havent found out how to make the drls or fogs work whith the highs YET as soon as i get some more free time i will be undermy hood disecting the relays for the fogs and drls

 

yea its that simple an hey its free try it ull like it

[drumset5994]

Thats awesome! How the hell does that work?

[drumset5994]

I actually, like to have control (control freak) -LOL

 

Someday im gunna figure a way to put a little switch on my column that activates all 4 (because i like the way the 2 and 2 look)

 

When you flash them...you look like a cop car at night ;) HAHAHAHA

[Stackrat]

This is NOT a very good way of doing it as you will be running all of the current for the Highs, lows and DRLs through the High's wires!!!

 

The Avalanche Forum guys have instructions on how to do it at the relay coils (under the fuse panel under the hood). This way, the spliced wires are only handling the current for the low-current relay coils. BTW, going this route, you'll need to wire in diodes.

 

Not sure if the same procedure will work for the Silverado, but that's the correct way to do it.

[3500in nc]

This is NOT a very good way of doing it as you will be running all of the current for the Highs, lows and DRLs through the High's wires!!!

 

The Avalanche Forum guys have instructions on how to do it at the relay coils (under the fuse panel under the hood).  This way, the spliced wires are only handling the current for the low-current relay coils.  BTW, going this route, you'll need to wire in diodes.

 

Not sure if the same procedure will work for the Silverado, but that's the correct way to do it.

 

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just wondering how this is the wrong way i mean the bulb is just getting a new ground from a non switched source

 

so theres no splicing into anything

 

i think that you are thinking about this as a 03 and up version which i have also posted as that used the diodes

 

have a merry christmas

[00HD2500]

To make the DRL's stay on all the time you can run a wire with a diode from the headlight relay to the DRL relay, I think it is from 85 to 85 on the relays. I have amber 3157 bulbs in my truck and boy are they bright! it looks really cool with the highs, lows, and DRL's on at the same time. Thinking of switchin to clear 3157's and see if I like that look also.

 

Mike

[Indy]

I did the yellow wire trick on my '99 yesterday. I went for a drive last night and burnt the retinas out of a couple of deer! I love it!

[NoWorries]

Cool, this is exactly what I came here to find.

 

Is there any way to keep the DRL's from coming on? How about running fog lights without the other lights being on?

 

Thanks!

[playtoy_18]

push your emergency brake down one click and it will disengage the DRL's on the OBS

[vampire]

this is interesting

[hoorders]

Ok here we go figured id post this here so info can be shared and ppl can save money

 

Take the headlights out of the truck then snip the yellow wires that come right out of the low beam bulbs, leave enough room to crimp a butt connector. then run the new wire to any available nearby bolt to ground the wire. it was super easy.

 

 

i could take pics of the wiring in the engine bay if you would like just PM me 

 

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Well......you know the old addage...'if its too good to be true it probably is'......that seems like a really easy fix.........have you or anyone else had this mod done for a length of time and lots of use of your high/low beams being on for long periods of time?.............just wondering about possible long term effects.

 

I would hate to fry some electrical in my 2000 Z71.

 

[ScottyBoy]

what if you just wire in a relay to each headlight and have the hightbeams trigger the relays to switch the low beams on? Wouldnt that be the safest way to do it?

[BretD04GMC]

There's a far easier way to do this. I found the info. on another Truck board and did it to my 04 Sierra.

 

Buy a $0.79 package of resistors at Radio Shack and jump a couple of the wires at the connector under the steering column.

 

When you hit the high beams, both lows and fogs will stay lit. The instructions should be on the site somewhere.