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Quad Headlights AND DRL?

 
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gwjturner
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PostPosted: Thu Nov 22, 2012 7:59 pm    Post subject:  Quad Headlights AND DRL? Reply with quote

2003 LS Sport

Is it possible to have the quad headlight upgrade while still preserving the DRL's?
It seems like using a couple of relays, one tapped into the existing DRL relay for a signal to a second relay that switches the low beams on with the high beams should work. Any thoughts?
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outonthetiles
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PostPosted: Sat Nov 24, 2012 11:36 am    Post subject:   Reply with quote

When I did the quad headlight mod, it did not affect my DRL's.

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gwjturner
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PostPosted: Sun Nov 25, 2012 9:05 pm    Post subject:   Reply with quote

I figured it out. I tapped off of the BCM "Headlamp Relay Control" wire (Blk/Wht) in order to supply a ground signal to the coil on a relay and then tapped a ground to the Dark Blue Low Beam wire. So now, whenever the BCM signals the Headlamp relay, which is when the DRL's ARE NOT on, this relay provides a constant and second ground to the low beams. When the High Beams are switched on, the low beams are powered on through this relay as well. When the light sensor turns on the DRL's, the BCM drops out the "Headlamp Relay" AND this relay. It works perfect.
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bbengineer
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PostPosted: Sun Nov 25, 2012 9:17 pm    Post subject:   Reply with quote

http://www.naioa.com/v2/module.....amp;t=4893

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gwjturner
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PostPosted: Sun Nov 25, 2012 9:29 pm    Post subject:   Reply with quote

Nice write-up..........I just added a second headlight relay in parallel with the factory one powering the low beams regardless of the dimmer switch position. I mounted mine directly behind the LH headlamp assembly and made my taps on the headlamp assembly plug wires. I tapped the BCM wire at the BCM and ran it out to the relay. Next weekend I'm going to try to get the fog lights to stay on with the high beams as well.
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