LF HEADLIGHT BURNED OUT
- Thread starter GT844
- Start date
2112
Blue/white 06'
Rick Mustang
GT Owner
Custom High-Performance Headlights | SW Lights
We Specialize in High-Performance Headlights. HID Projector Retrofits, Custom Lens Etching, Bluetooth RGBW, Custom Paint, and Headlight Restoration. Improve visibility and More!
www.sw-lights.com
2112
Blue/white 06'
Custom High-Performance Headlights | SW Lights
We Specialize in High-Performance Headlights. HID Projector Retrofits, Custom Lens Etching, Bluetooth RGBW, Custom Paint, and Headlight Restoration. Improve visibility and More!
Thank you Rick
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fjpikul
GT Owner
Just as an aside, there is no lateral adjustment of the light, just vertical. You should replace the turn signal bulb while it is all apart. You said the other light is working so I assume the dashboard switch is ok.
It's fixed. I hope this information helps anyone who has experienced a headlight failure in their GT. First of all each headlight has two fuses and one relay. The first fuse #17 is a 15 Amp located in the passenger compartment The second fuse is numbers 17 and 18 are 25 Amp located in the power distribution box in the front compartment. Little did I know that there are also two relays in this Power Distribution Box, #31 right headlight and #32 left headlight. The fuses checked out good so I proceeded with the laborious job of removing the inner fender liner. (Not fun)
The entire headlight assembly is secured by 8 screws and must be removed to replace the Philips XenTron XLS135 XenDrive XLD135-40 OEM D1S Ballast. The Xenon bulb can be replaced without removing the headlight assembly. The front two screws are difficult to reach unless you have really long arms. Since everything was apart, for a relatively small amount of money, I replaced both the bulb and ballast. I bench tested the light an "yeah" it worked. After reinstalling the light, I pluged it into the harness and there was NO HEADLIGHT. This is when I discovered the relays. To test, I swapped the relays. Now I have a left headlight but no right. It is a common relay and can be purchased at any auto parts store for about $13. Had I known about the relays, I could have saved myself a lot of greif, time and money. Hope this helps.
The entire headlight assembly is secured by 8 screws and must be removed to replace the Philips XenTron XLS135 XenDrive XLD135-40 OEM D1S Ballast. The Xenon bulb can be replaced without removing the headlight assembly. The front two screws are difficult to reach unless you have really long arms. Since everything was apart, for a relatively small amount of money, I replaced both the bulb and ballast. I bench tested the light an "yeah" it worked. After reinstalling the light, I pluged it into the harness and there was NO HEADLIGHT. This is when I discovered the relays. To test, I swapped the relays. Now I have a left headlight but no right. It is a common relay and can be purchased at any auto parts store for about $13. Had I known about the relays, I could have saved myself a lot of greif, time and money. Hope this helps.
ultrasportracing
GT Owner
HighHP
GT Owner
Thanks for letting us know. Much appreciated. I think about everyone would assume it was the headlight. How often has a headlight gone out and it was NOT the headlight bulb? Everything on the GT is easy to remove, except those fender liners.
Tomcat
GT Owner
dreimer
GT Owner
This is what is great about this forum - really practical info, especially when someone learns the hard way and shares it so others don't have to do the same.
PeteK
GT Owner
Thank you!
I’m not sure I wouldn’t have jumped to the same conclusion (as I have on other things), but did you check for voltage at the headlight connector first?
I’m not sure I wouldn’t have jumped to the same conclusion (as I have on other things), but did you check for voltage at the headlight connector first?
Yes it showed 12 volts. I don't really know why the relay is needed anyway. Unless the head lights require a higher current draw that is required by the Phillips ballast and kicks in with the headlight switch. The 12v I saw might have been for the side marker light or something. It definitely was the relay, I'm just glad it's fixed
twobjshelbys
GT Owner
Add this to the list of failure modes where swapping a relay ought to be close to first in the troubleshooting tree. Another is fuel pumps. Any others?
PeteK
GT Owner
Not so fast.
GT844 said that he checked for 12v at the headlight connector at the beginning of his troubleshooting. That would tend to rule out the relay, at least initially. however, I could see that a relay with corroded contacts would pass 12v at low amperage, but not enough amps when connected to a significant load, that would cause the HID headlight not to start. By replacing the light bulb, ballast, and relay, there isn’t much else in the circuit, but keep alert for any other symptoms.
GT844 said that he checked for 12v at the headlight connector at the beginning of his troubleshooting. That would tend to rule out the relay, at least initially. however, I could see that a relay with corroded contacts would pass 12v at low amperage, but not enough amps when connected to a significant load, that would cause the HID headlight not to start. By replacing the light bulb, ballast, and relay, there isn’t much else in the circuit, but keep alert for any other symptoms.