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2005 Subaru Legacy, DRL circuit problem


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laz_ 
Member - Posts: 3
Member spacespace
Joined: September 16, 2004
Location: United States
Posted: November 29, 2005 at 6:10 PM / IP Logged  
hello all, I hope you can help me out on this problem that I have. I own a 2005 Subaru Legacy GT which comes OEM with DRL's on the low beam. I changed the low beam to HID's and what I wanted to do was make the high beam act as the DRL's. This part I figured out how to do by acquiring a wiring diagram from the headlight system. This is what the diagram looks like:
2005 Subaru Legacy, DRL circuit problem -- posted image.
At the bottom of the diagram is the DRL module which shows a brown wire activating the low beams when the car starts to move. What I did is use a relay to connect the brown wire to the red wire which also comes from the DRL module and activates the high beams. I had to use a relay because if I simply spliced the brown wire to the red wire the high beams would not turn off when the low beams turn on.
Now to the problem, the wires are negative ground, and I measured the negative voltage on the brown wire when it activates the DRL's and it shows a 12.5 VDC when running as DRL's and 14VDC when tunning as regular low beams. Of course for the high beams this voltage is too high and makes the lights too bright. What I want to do is lower the voltage on the brown negative wire to around 10 VDC when the DRL's are running. I used the OHM's calculator on the site, and if I am not mistaken the lights are using around 10 AMPS. Am I also correct to assume that the voltage is around 120 watts (60 watts X2) or is the load only 60 watts? (each lightbulb is 60 watts).
So my question is can I use a resistor on the negative brown wire before it connects to the red wire, and if so what resistor can I use. If not how would I handle this problem?
TIA
Xavier
timka86 
Member - Posts: 5
Member spacespace
Joined: April 04, 2005
Location: United States
Posted: December 06, 2005 at 2:03 PM / IP Logged  

It looks from the diagram that you have one bulb for low and high beams.  If that's the case and you got HID's you wont have DRLs.  So do you have separate bulbs for high and low beam, or one for both?

laz_ 
Member - Posts: 3
Member spacespace
Joined: September 16, 2004
Location: United States
Posted: December 06, 2005 at 2:13 PM / IP Logged  
No, they aer two separate bulbs. H7's in a projector, and 9005 or is it 9006? Whichever is for high beams. For the diagram it appears they share the positive, and get switched on from the negavite side.
timka86 
Member - Posts: 5
Member spacespace
Joined: April 04, 2005
Location: United States
Posted: December 06, 2005 at 5:54 PM / IP Logged  

Why do you really want DRL's?  Most people try to gt rid of them.  I have on 00 Grand Am GT and i just disabled mine because i have a single bulb high low and i changed to HID's. So the DRL's are bad for HID's.  You can use a relay and have your DRL's turn on your low beam which in your case is your HID's.  So you'd have HID's running all day.  This would of course mean they wouldn't last as long.

laz_ 
Member - Posts: 3
Member spacespace
Joined: September 16, 2004
Location: United States
Posted: December 06, 2005 at 8:18 PM / IP Logged  
Yes I understand all the good and bad things about DRL's, but that is not the question here. I have separate bulbs for low beam, and high beam, so I am not trying to use the HID's as DRL's. This is a project that will not only benefit me, but a whole bunch of other people. I already have the high beams DRL's working, the only problem is that they are too bright, thus I need to reduce the voltage, that is it. I think I have narrowed it down to needing a 1 ohm rsistor, I just need to find the right one, and something that will not burn.
Thanks again,
Xavier
timka86 
Member - Posts: 5
Member spacespace
Joined: April 04, 2005
Location: United States
Posted: December 07, 2005 at 8:50 AM / IP Logged  

well in that case you can use a resister to kill the voltage. But you need a high wattage resister.  60 watt to be exact.  It's going to be a big resister.  I work ar radioshack and we got a 10 ohm, 10 watt resister and it's the size of to tootsie roll.  I don't know if they make 60 watt resisters.  would your low beam bulb fit in your high beam socket? that way you can use the brown wire to power the DRL's, but the down side is your high beam beam wouldn't be so bright.

Another idea just came to mind...  most bulbs have the same shape it's the plug that differs, so if you get a dual filament bulb, like a 9007.  Have the high beam filament wired to your high beam, and the low beam strictly for DRL's.  You can purchase aftermarket wirring harnesses for bulbs like that.


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