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Unread 08-28-2014, 01:13 PM   #1
clemsonscj
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Mod to let fogs stay in with brights?

Is there any way to do this that anyone knows of? I have been able to do it with all my previous vehicles.

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Unread 08-28-2014, 02:54 PM   #2
johngreen1234
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I asked this 2 years ago and was told that it requires a dealer starscan, if they'll do it. Possibly it is illegal to do this in the USA, I was told. I shined the idea.
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Unread 08-28-2014, 03:25 PM   #3
JRLT
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Most states only allow four forward facing lights. So, it's either dims and fogs or dims and brights.
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Unread 08-28-2014, 05:28 PM   #4
ca07wk
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Back in my import days we used to run a jumper from the positive of the high beams to the positive of the fog light and the highs would provide power to the fogs
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Unread 08-28-2014, 06:32 PM   #5
clemsonscj
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Quote:
Originally Posted by JRLT View Post
Most states only allow four forward facing lights. So, it's either dims and fogs or dims and brights.
I realize that but my question isn't as much on the legality, but more on the possibility.

Like on my Tacoma, there was a relay for the fogs that was engaged when the ignition was turned on. When the brights were turned on, that relay was disengaged. All you had to do was stick a piece of rubber underneath the relay tab so that it couldn't ever come down. That's kinda the ideas I'm looking for.
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Unread 08-28-2014, 07:15 PM   #6
JRLT
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As it was said before; gotta get a dealer to flash the computer to do that.
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Unread 08-28-2014, 07:23 PM   #7
clemsonscj
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Quote:
Originally Posted by JRLT View Post
As it was said before; gotta get a dealer to flash the computer to do that.
I'll try and find a way tomorrow.
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Unread 08-28-2014, 08:20 PM   #8
clemsonscj
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Found the relay. Shouldn't take more than 5 minutes to get it working. Will be my day project tomorrow.
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Unread Yesterday, 04:56 AM   #9
hxdrummerxc
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Quote:
Originally Posted by clemsonscj View Post
Found the relay. Shouldn't take more than 5 minutes to get it working. Will be my day project tomorrow.
You got me interested. I didn't even realize the fogs turned off with the brights. Lol I don't get to use my brights too often though

Please keep us updated
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Unread Yesterday, 08:54 AM   #10
caulk04
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It would be pretty simple to add a wire from the relay feed of the high beam to the relay trigger for the fogs and that shouldn't cause any issues unless the computer monitors resistance across that circuit...

That said, since we have a four bulb low/high setup I don't see much need to leave the fogs on too. Already pulling something like 20A just with the low/fog or low/high, I don't feel like pulling more amperage for no more actual light output.

To each their own, I'm leaving mine alone.
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Unread Yesterday, 01:09 PM   #11
clemsonscj
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Turns out the relay does not change even when the highs are turned on. I measured voltage on all terminals and nothing changes when the high beams are switched on. So apparently there is some other location that the fogs are being shut off.
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Unread Yesterday, 02:06 PM   #12
bersh
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I did this mod on my 04 2500HD by adding a diode between the fog and high beam relays. I ran it that way for about a month and removed it as I found it reduced my ability to see as well downrange.
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