Need advice on resolving low-beams issue

[Squiggle05GT]

Hey all, I need some advice on figuring out a little issue

Problem is my low-beams don't turn on, my high-beams on the other hand do as well as my fog lights. I noticed it when i first bought the car, but didn't really care about it, but now I'm at the point in my cars build where I don't plan on adding anything in the future keeping the car as is and just keeping up with maintenance and replacing any parts that go out/break. Are there any fuses I could check relating to this issue? also is it possible to have both the fog lights and low-beams on at the same time if I were to fix my low beams issue? Also my year model is a 2005 GT if that helps out.

Please let me know.

 

[cavero]

Are they stock halogen bulbs? Or did someone do an HID conversion?

It might be worth starting with the simplest fix first - have you tried another set of bulbs to make sure both low beams aren't burnt out? With halogen you have two separate filaments, one for the low beams and a second one for high beams. Seeing as how most people don't drive around with their brights on all the time (except around where I live), the low beams would burn out first.

As far as fog lights /driving lights go, normal operation is you can turn them on with low beams, but they'll turn off with your brights automatically for legal reasons. You're only allowed to have 4 headlights on at a time and brights count as 2 each

Hope this helps

 

[DieHarder]

Hey all, I need some advice on figuring out a little issue

Problem is my low-beams don't turn on, my high-beams on the other hand do as well as my fog lights. I noticed it when i first bought the car, but didn't really care about it, but now I'm at the point in my cars build where I don't plan on adding anything in the future keeping the car as is and just keeping up with maintenance and replacing any parts that go out/break. Are there any fuses I could check relating to this issue? also is it possible to have both the fog lights and low-beams on at the same time if I were to fix my low beams issue? Also my year model is a 2005 GT if that helps out.

Please let me know.

Here's some troubleshooting help.

Here's the circuit: https://iihs.net/fsm/?d=40&f=Headlamps. Autolamps.pdf&p=1

Ford Workshop Service & Repair Manuals - fordrepair.info - 2005 Mustang 2005 Mustang Headlamps. autolamps

Ford Workshop Service and Repair Manuals, 2005 Mustang Wiring Diagrams Headlamps. Autolamps

iihs.net

And here's step by step troubleshooting for the headlamps:

Headlamps: https://iihs.net/fsm/?d=389&f=Headlamps.pdf

Pinpoint tests: Low Beams inoperative: https://iihs.net/fsm/?d=389&f=Headlamps.pdf&p=13

Ford Workshop Service & Repair Manuals - fordrepair.info - 2005 Mustang Exterior Lighting Headlamps

Ford Workshop Service and Repair Manuals, 2005 Mustang Workshop Manuals Electrical Lighting Exterior Lighting DIAGNOSIS AND TESTING Headlamps

iihs.net

Ford Workshop Service & Repair Manuals - fordrepair.info - 2005 Mustang Exterior Lighting Headlamps

Ford Workshop Service and Repair Manuals, 2005 Mustang Workshop Manuals Electrical Lighting Exterior Lighting DIAGNOSIS AND TESTING Headlamps

iihs.net

Worth your time to read all of the sections starting with Description and Operation; then Diagnosis and Testing: https://iihs.net/fsm/?d=387

Note: the online manual jumps around a bit so you may have to search around to follow some of the sections. Still, better than nothing.

 

[07 Boss]

My headlights stopped working along with my horn a while back. Suspect it may be the SJB but never really investigated. I have aftermarket HIDs so I just took the fog light relay and hooked it up to the headlights to get home and it's been that way since. I currently don't have fogs because of this but I can't remember the last time I actually turned them on.

 

[Squiggle05GT]

Are they stock halogen bulbs? Or did someone do an HID conversion?

It might be worth starting with the simplest fix first - have you tried another set of bulbs to make sure both low beams aren't burnt out? With halogen you have two separate filaments, one for the low beams and a second one for high beams. Seeing as how most people don't drive around with their brights on all the time (except around where I live), the low beams would burn out first.

As far as fog lights /driving lights go, normal operation is you can turn them on with low beams, but they'll turn off with your brights automatically for legal reasons. You're only allowed to have 4 headlights on at a time and brights count as 2 each

Hope this helps

Yea the original owner had in incandescent bulbs for everything in the front, I replaced all the bulbs with New SEALIGHT H13 H10 LED Light Bulbs and it made a huge difference at night, especially the turn signals pretty bright. I tried seeing if my lowbeams worked then, but still nothing, I don't know if it might be turn-switch inside the cabin? where you adjust your lights. but yea I've been using my fog lights at night, but will use my highbeams if the road is too dark.

 

[cavero]

They didn't even work with the incandescents?