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Old 01-29-2003, 04:33 AM   #1
Uncle Ben
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Default HID's and Daytime Running Lights

Ok, I've read up in the archives and it sounds like HID's and DRL's won't mix. The lesser current draw will make the HID's burn out prematurely, meaning the DRL's will HAVE to be disconnected, correct?

Is there an easy way to get that little parking light in the headlight housing to light up as a DRL?
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Last edited by Uncle Ben; 01-29-2003 at 04:43 AM.
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Old 01-29-2003, 05:11 AM   #2
Frederf
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HIDs don't like running at anything but full power. Imagine trying to hook up a flourecent light to a dimmer switch in your house... same principle; doesnt' work. Sadly, this is why Canadain STis arent' getting HIDs, since they are legally required to have DRLs.

If you're planning on installing HIDs in your car, you need to disconnect the correct DRL unit. There's two places to disable DRLs, in the engine compartment and another one behind the glovebox I think. With HIDs you have to disable the behind-glovebox DRL unit. If you disable the underhood one it's still not HID-friendly even though the halogen DRLs won't come on.

About getting the small light in the headlight to be your DRLs.

1. I don't these are legal DRLs in places that require them.

2. You could run under running lights (between off and low beam on the headlight stalk) but your dash lights come on (as well as some other exterior lights?)

3. You could flip the switch for the parking lights which would leave the dash dark, but I think that switch also lights up other exterior lights that normally aren't in the "DRL package."
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Old 01-30-2003, 01:48 PM   #3
WRX Bamboo Steamer
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Why disable them, they are a safety feature. I just replaced the daylight runing light resister with a jumper. This will let the HID's get the full voltage they need. True the lights are not dimmed like the originals but they don't blind people either.
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Old 01-30-2003, 03:25 PM   #4
Frederf
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Then why not just leave the headlight switch on all the time? I like the ability to turn my lights off if I'm pulling up to a glass building and don't want to blind the people inside, etc.
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Old 01-30-2003, 04:24 PM   #5
Alan
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There's no reason not to disconnect the big dropping resistor in the engine compartment to disable the running lights. Even with HID units there's no way any power can go to the HID system when that resistor is removed, except when the light are turned on. Just look at the wiring diagram and you'll see that the lights will be wired to an open circuit with no chance of any voltage or current.

And I did it that way on WRX and it works fine.
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Old 01-30-2003, 08:08 PM   #6
Mulder
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Not necessarily-
The dropping resistor provides a reduced-current path to ground through the existing wiring, when the DRL system is activated by the control module. With the stock lights, or aftermarket ones connected to only the factory headlight connector, removing the resistor does break the circuit and eliminates the DRL function.
However, the DRL control module is still active and continues to provide power to the headlight circuit whenever the key is on, the lights are off and the e-brake is down. So if aftermarket lights such as HIDs are connected to a direct ground source, thereby bypassing all of the factory ground switching, they will be turned on by the DRL module even though the resistor is disconnected.
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Old 01-31-2003, 08:45 AM   #7
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Frederf:

I don't want my running lights on and my Defi gauges dim when the headlight switch is on, that is why I don't want to have the switch on.

Mulder has a good point. My Eaglite hid's ballast has a live ground so IF they are touching the body of the car, it will complete the ground circuit regardless if the DRL ballast is removed.
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