4 headlight mod

Yes, simple and cheap. That is the correct yellow.

I tapped the yellow wire and grounded it the stud on the firewall. I then tested the lights. No change!! :crying: I still only get two lights on high. My ride is a 99 Silverado (new body style). Any thoughts on why it did not work??

Marmot

I tapped the yellow wire and grounded it the stud on the firewall. I then tested the lights. No change!! :crying: I still only get two lights on high. My ride is a 99 Silverado (new body style). Any thoughts on why it did not work??

Marmot

make sure it is getting a good connection. it will work. has been done many times with no problem. make sure wire is wrapped tightly and soldered to the yellow and make sure it is grounded to the bolt and there is no corrosion on it.

Sorry to bring up an old topic, but I just did this tonight and thought I would add that you don't have to ground to the ground for the hood light. There is a bolt directly below the wire in the electrical box that works just fine. Only need about a 8" wire to hook it up there. Much easier.

Brew

Sorry to bring up an old topic, but I just did this tonight and thought I would add that you don't have to ground to the ground for the hood light. There is a bolt directly below the wire in the electrical box that works just fine. Only need about a 8" wire to hook it up there. Much easier.

Brew

that's cool; I may redo mine, knowing that. Hide the wire I grounded it to

OK, I have a 2003 Silverado 1500HD. I want to try and do the 4 headlight mod and have all 4 light come on with high beam. Just to clarify, what is the best and easiest method to use?

Sorry if this is a repeat. Just point me in the right direction.

Thanks

Bruce

this is a nice mod. I did it to my truck = no problems.

OK, I have a 2003 Silverado 1500HD. I want to try and do the 4 headlight mod and have all 4 light come on with high beam. Just to clarify, what is the best and easiest method to use?


Here is a link I found for the 2003 + 4 headlight mod. Simple and completely hidden.

2003 up 4 Headlight Mod (http://gm-trucks.com/home/content/view/231/25/)

I will be doing this soon also.

Hey Guys, did the mod, it was a piece of cake and also one that was worth my time. Beautiful sight as i turned my hi beams on, and low beams stayed on. Thank you all, just a quick question for as for the HVAC controls and LEDs. I opened up the HVAC control unit, and replaced all the lights (non working) inside the switches for freash/recirc/ac. It workes fine, i replaced these with white leds. The acutal "DOTS" on the switches, i replaced with blue LEDs-looks pretty cool, when i hooked up to the same power source 4 more leds to shine some light on the fan speed/position/ etc... the 4 leds would not work, but when on the bench and a 12 cell would be hooked up to it, all the illumination would work both in the switches and in the knobs. Why doesn't it want to work in the car?

Here is a link I found for the 2003 + 4 headlight mod. Simple and completely hidden.

2003 up 4 Headlight Mod (http://gm-trucks.com/home/content/view/231/25/)

I will be doing this soon also.

Did I understand it correctly? Are you bascally "bridging" the 2 relays (on pin #85) with a diode? Sounds simple, though, I'm not sure how he figures that looks factory.

Sounds simple, though, I'm not sure how he figures that looks factory.

Guess since it is all hidden under the fuse box cover it is more hidden than the wire to the firewall ground....

Thanks for the info. I took a look and it seems fairly simple. I was looking at my relays. Does it matter which direction they are installed. When I pulled the relay I noticed the numbers did not match the picture on the cover. The relay was turned 180 degrees. I noticed this on a couple other relays. I put it back in and everything seems to work. Should I turn the relay so that the numbers on the relay match up (86, 30) (87, 85) with the numbers on the picture.

Thanks

where is the best place to get a 4 hi mod for a 99 silverado, and how much do they normally run.

where is the best place to get a 4 hi mod for a 99 silverado, and how much do they normally run.

Like 3 or 4 bucks... check further back in this thread. All you gotta do is tap and ground a wire

Like 3 or 4 bucks... check further back in this thread. All you gotta do is tap and ground a wire


Yeah what he said. It should only take you like 15 minutes tops to complete. I was suprised how quick it all went together and even more impressed at how it looked at night...

Just finished with the modification on my 2003 1500hd. Works great and it was quick and easy. Thanks for all the info. Still had a question on the relays. Does it matter which way they go in? They seem to work both ways. Mine were backwards 180 degrees from the diagram.

Thanks

Sorry to bring up an old topic, but I just did this tonight and thought I would add that you don't have to ground to the ground for the hood light. There is a bolt directly below the wire in the electrical box that works just fine. Only need about a 8" wire to hook it up there. Much easier.

Brew

Well, I got out, and re-did my mod today. The bolt in bottom of the box did not seem to ground the wire, but there was one on the fender near the box that worked fine... All stealth-like, now. Thanks, man!

Still had a question on the relays. Does it matter which way they go in? They seem to work both ways. Mine were backwards 180 degrees from the diagram.

Thanks

Read a few other forum threads and in origonal form the relay can be 180* off and still work. When you do the mod it must be as the diagram shows the 85 location...