03 mustang need to turn extra drl's off when light switch is turn on - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 03-29-2014 Thread Starter
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03 mustang need to turn extra drl's off when light switch is turn on

I have two sets of fog lights in my front bumper. The new ones are HID and the old ones are unplugged and just fill the hole in the bumper. I would like to hook them up to the day lights and have them turn off when I pull the switch for my head lights. Can anyone tell me how?

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post #2 of 7 (permalink) Old 03-29-2014
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Confirm if your car has the daylight running light feature.


2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #3 of 7 (permalink) Old 03-29-2014 Thread Starter
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Yes it does have the day light feature
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post #4 of 7 (permalink) Old 03-29-2014
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Are you familiar with HOW the DRL feature works? It works by rapidly turning the voltage on/off such that the average voltage is lower. The problem is that the output of the DRL module is spliced into the same line that runs to the head lights. Therefore there isn't an easy way to use a simple relay to tell the difference between running on DRL and full head lights. Such a relay would have to be voltage aware. Perhaps a relay with an adjustable pick up coil.

Another idea might be to tap into the parking lights. But this is likely to need two relays to do what you want to do.

It can be done. But if you are expecting a "cut this wire and run it here" this is not it. Sooooo how good is your electrical?

A set of wiring diagram will be an almost must. If interested in getting a set for yourself I may be able to help. PM if interested.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #5 of 7 (permalink) Old 03-29-2014 Thread Starter
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My electrical is not very good. I have the diagrams already. I hooked a temporary lead to the light socket and it feeds the light no problem. however when I pull the switch the lights stay on of coarse. I could use a negative ground switch in the cab to manually turn them off. I was just hoping to tie some type of relay and even a separate power source to the lights so when I pull the switch it turns off. I don't expect an easy fix. I just don't have the knowledge with relays to figure anything out.
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post #6 of 7 (permalink) Old 03-30-2014
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If you have a set of diagrams then you should be able to see for yourself what I was trying to tell you. Follow the wire out of the DRL module to the splice.

Consider this idea. What if a relay coil was wired into the parking lights? Then the fog lights were wired through the Normally Closed (NC) contact of the relay. Then when the parking lights were turned on, this would turn off the fogs.

Not exactly what you were thinking. But does accomplish the same thing.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #7 of 7 (permalink) Old 03-30-2014 Thread Starter
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Thanks for the tip I will try it out.
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