fog lites on hi and low

[DURAMAX TIM]

On the GM trucks we soldier in some diodes to have all 6 lights on w/ the hi beams.
Any one here checked or done it on the 3?

I get some time I'm going to try and get the fogs it to work.

[f5fstop]

Yes, it can be done, but could take some time to figure out. Both headlamps and Fog are BCM controlled.
BCM controls a relay to power the fogs, BCM controls the power circuit to the headlamps, and also controls the HI/LO beam relay to supply ground for the HI or LO beam.
Heading out of town, so I don't have time to really look right now.
Probably all you will need are some relays, maybe a few diodes, but you should be able to isolate the circuits with relays.

[wpage]

If you value your warrentee dont do it...

[timgco]

I'd add some lights before messing with the factory harness.

[DURAMAX TIM]

Originally Posted by wpage

If you value your warrentee dont do it...

WHY?

on the GM trucks and SUVs I've done it to, it only takes 5 seconds or so to switch the relays back to stock.

Wife just said the hi beams aren't very bright.

[marin8703]

why do they make the fogs turn of with highbeams anyways?

[deserth3]

If it's all controled by the BCM you may be able to get the dealer to change it through software.
May be worth asking anyway.

[f5fstop]

Dealer can't change it via software. Reason is, GM is following state laws. Most states require the fog lamps to dim with the HI beams, so they conform to state laws. (Not that the police ever enforce this law.)
As long as you isolate the circuits to prevent feedback to the computer, the only warranty you would void is the warranty for wiring you cut into.
I have tapped into many wires in almost all my vehicles, and no one has blamed the wiring for a fault and refused warranty on any item.

[BuzzH3]

I used to own a GMC Sonoma and having the quadbeams (low and high beams at the same time) was a huge thing on their forums. I believe that it was Painless Wiring (I think that is their name) that actually has a kit to make this work at least on GM trucks. I don't know how different the headlight wiring is between GM trucks and the H3, but you might want to check them out. Here is a link to how it was done on the Sonoma without a kit. Again, I'm not sure if this will even work on the H3.

http://www.fmtc.com/~brule/quad.html

[DURAMAX TIM]

NOT RESPONSIBLE FOR THE RESULTS OF THIS SUGGESTION


All it takes is a $.50 diode and they are done.

took a few minutes and found the relays and figured where to put the doide in.

no soldiering just pull the relay, insert the correct diode leg and reinsert the relays.

[HummerNewbie]

Originally Posted by DURAMAX TIM

NOT RESPONSIBLE FOR THE RUSULTS OF THIS SUGGESTION

I like the disclaimer

[DURAMAX TIM]

works fine for me, don't want someone using a stick of dynamite for a diode and spreading hummer/human parts all over


Someone also said it'll void the warranty, don't know HOW but CMA just in case.