Make low beams stay on with high beams. - Chevy Colorado & GMC Canyon
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post #1 of 26 (permalink) Old 01-21-2007, 04:53 PM Thread Starter
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Make low beams stay on with high beams.

Haven't seen any threads about this so I thought I would throw in my two cents. Some years ago, GM engineers decided to wire Chevy pickups so when the driver turned on the high beams, the low beams go off. This doesn't make sense to me so I came up with a fix.

I started by calling Painless wiring. I asked if they made anything for the Colly with 4 headlights that would make the low beams stay on with the high beams. The tech rep talked to his engineers and was told that the kit for late model Silverados would work.

So I bought the kit (high beam relay) from Jegs, installed it and it didn't work. The low beams still turned off when the highs came on. I called Painless back; I told the tech rep what happened and got him to email a wiring schematic for the front headlights on the 05 Colorado.

After looking at the schematic, I came up with a fix. All four headlights have power to them all the time. A relay controls the ground circuits. When the lows are on, the ground is taken away from the high beams and vice versa.

I didn't post pictures because the fix is simple.

Remove the grille and unbolt the headlight assemblies. The headlights use two 10mm bolts.

Remove the wiring harnesses from the back of the headlights and set them out of the way.

Do one side a a time.

Take the harness for the low beam and unwrap the factory electrical tape so you can see the two wires. On my 05 Colorado Z71, the "hot" wire is "orange" and the "ground" wire is "dark blue".

Splice into the dark blue wire using a Quick connector and 12 - 18 inches of wire (use 18 ga or heavier wire).

Attach the other end of the wire to a good ground, (I drilled a small hole in the sheet metal behaind where the headlight assembly mounts).

I used an electrical connector, sheet metal screw, and two star washers.
The hardware store calls them "shakeproof" washers. They keep the screw tight and help make a good ground.

Wrap some new tape around the wires where they come out of the plastic loom.

Add a ground wire to the other low beam harness in the same way.

Reinstall the headlights, don't forget to plug the harnesses in (I did this, LOL).

Reinstall the grille and you are done!

Now the low beams will stay on when the high beams are turned on. It makes a big difference when driving backroads in deer country.

I also replaced the headlight bulbs with Silverstars. I get flashed alot at night because other drivers think my high beams are on. Then I turn on the high beams and give em all four lights. (I know, I know, but it's fun).

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post #2 of 26 (permalink) Old 01-21-2007, 04:57 PM
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Uh, if you'll look in the Aftermarket Accessories section, you'll see a couple of threads about MrTaillights.com that has had a kit out for some time. Several of us have done the mod, it only takes a few minutes to do, and it's pretty cheap.


See this thread.

http://coloradofans.com/viewtopic.php?t=21184

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post #3 of 26 (permalink) Old 01-21-2007, 04:59 PM
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Quote:
Originally Posted by Danny45
Uh, if you'll look in the Aftermarket Accessories section, you'll see a couple of threads about MrTaillights.com that has had a kit out for some time. Several of us have done the mod, it only takes a few minutes to do, and it's pretty cheap.


See this thread.

http://coloradofans.com/viewtopic.php?t=21184
x2

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post #4 of 26 (permalink) Old 01-21-2007, 05:48 PM
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Quote:
Originally Posted by Rsquires67
Quote:
Originally Posted by Danny45
Uh, if you'll look in the Aftermarket Accessories section, you'll see a couple of threads about MrTaillights.com that has had a kit out for some time. Several of us have done the mod, it only takes a few minutes to do, and it's pretty cheap.


See this thread.

http://coloradofans.com/viewtopic.php?t=21184
x2
x3 ya before i do anything, i always check the forum


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post #5 of 26 (permalink) Old 01-21-2007, 07:27 PM Thread Starter
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Quote:
Originally Posted by sillyoldtayo
Quote:
Originally Posted by Rsquires67
Quote:
Originally Posted by Danny45
Uh, if you'll look in the Aftermarket Accessories section, you'll see a couple of threads about MrTaillights.com that has had a kit out for some time. Several of us have done the mod, it only takes a few minutes to do, and it's pretty cheap.


See this thread.

http://coloradofans.com/viewtopic.php?t=21184
x2
x3 ya before i do anything, i always check the forum[/quote

Uh, like I said, I HADN't SEEN anything before on this subject. If I always checked the forum/quote before I did any mods to my Colly, I'd never have time to do a mod.

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post #6 of 26 (permalink) Old 01-21-2007, 08:24 PM
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Of course then again, if you spent 5 minutes on a search to check the forum you'd probably spend half the time completing certain mods.

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post #7 of 26 (permalink) Old 01-21-2007, 08:29 PM Thread Starter
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Of course then again, if you spent 5 minutes on a search to check the forum you'd probably spend half the time completing certain mods.
Nah, cause after looking at all the mods, I would be at the bank applying for a loan. :D :D

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post #8 of 26 (permalink) Old 01-21-2007, 08:38 PM
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I know the feeling. It's tough to decide which direction to go with things after looking at some of the trucks on this site.

edit: Why go to the bank? YOU LIVE IN FORT KNOX!

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post #9 of 26 (permalink) Old 01-22-2007, 12:09 PM
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Even easier is to simply modify the ground relay in your fuse box. Take the lid off the beam selector relay and solder a jumper between the master and the low-beam pin, so that even when the high-beams are selected there is still a ground to the low-beams. Took about 5 minutes, was a totally free mod, and didnt have to modify any of my factory wiring.




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post #10 of 26 (permalink) Old 01-22-2007, 01:19 PM
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x2

Same concept what I did, only instead of running the wire out of the case, I just soldered a jumper between the frame and the pin. Since pictures are worth a thousand words, it's in my gallery. :D

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post #11 of 26 (permalink) Old 01-25-2007, 10:24 AM
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Originally Posted by Sarge
x2

Same concept what I did, only instead of running the wire out of the case, I just soldered a jumper between the frame and the pin. Since pictures are worth a thousand words, it's in my gallery. :D
Thanks for the pic; for those of us that don't quite see the light (!) with wiring, your pic IS worth a 1000 words!

mark

ps I found the relay, but I'm not sure which pin to join to the frame. What about just taping up the solenoid? Or is it taping open the solenoid??

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post #12 of 26 (permalink) Old 04-19-2007, 12:04 PM
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So if I just modify the relay... will my lows and fogs stay on?

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post #13 of 26 (permalink) Old 04-19-2007, 02:34 PM
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So if I just modify the relay... will my lows and fogs stay on?
When your highs are on your fogs are off, but the fogs will still work when just your lows are on.

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post #14 of 26 (permalink) Old 04-19-2007, 03:47 PM
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Hmmm I want all 6 on how do I do that?

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post #15 of 26 (permalink) Old 04-19-2007, 04:00 PM
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Wire your fogs with a separate circuit. The switch on your dash controls your BCM, then the BCM controls the relay for your fogs. I haven't figured a way around it with out just putting them on another circuit, but it can be done.

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post #16 of 26 (permalink) Old 04-19-2007, 04:08 PM
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The kit includes the relay that will allow the fogs to work with the highs and lows. But, you need a switch from them to turn them off if you don't want them on all the time your lights are on.

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post #17 of 26 (permalink) Old 04-19-2007, 06:49 PM
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If my highs are on... I want all 6 on... if my highs are off I want all 4 on and to retain OEM function.

Will the Mr. Tailights kit do that for me?

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post #18 of 26 (permalink) Old 04-20-2007, 12:36 AM
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You will not retain OEM function without the extra switch from Mr. Taillights. The fogs will be on anytime your lights are on without the switch. You will not be able to shut the fogs off without it.

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post #19 of 26 (permalink) Old 04-20-2007, 11:54 AM
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Hmmm... I might just do the jumper mod so that when the highs are on the 4 lights are on, but then when the lows are on I have normal function.

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post #20 of 26 (permalink) Old 04-20-2007, 02:04 PM
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Originally Posted by Cobra4B
Hmmm... I might just do the jumper mod so that when the highs are on the 4 lights are on, but then when the lows are on I have normal function.
I would check that mod again. I seemed to remember that it only affected the high beams and low beams, not the fog lights.

I could be wrong though.

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