head light, brights not working.

Mlx50man · November 23rd, 2009, 08:15 AM

hey guys so heres my problem. My headlights work but when i go to flash the brights or just turn the brights on the lights go completely out. is it a fuse or could it be possible that the high beam on both bulbs went at the same time????? if its a fuse could you tell me which one?

sickfox · November 23rd, 2009, 08:22 AM

I would swap out a buld first, see what happens then move on.
I dont think there is a fuse just for high beams but i could be wrong with out looking.

Maybe it's the high beam switch?

Mlx50man · November 23rd, 2009, 12:01 PM

ya thats what i was thinking, its just weird that they both went out at the same time you know.

WDfrmTN · November 23rd, 2009, 04:02 PM

Headlight control module, aka multi-function switch.
Check the highbeam output.
Year & model?

flyin ryan · November 23rd, 2009, 04:46 PM

head light switches are a common failure with aero nose foxes so I wouldn't rule it out

Mlx50man · November 23rd, 2009, 07:44 PM

Its a 90 5.0L lx ok so is it the actuall switch? cuz when i go to turn them on it just turns the lights out completely.

WDfrmTN · November 24th, 2009, 12:32 AM

If it affects high beams only:
Headlight control module, aka multi-function switch.
Check the highbeam output.
On son's '91 its a LG/BK wire.
Wire should be in bundle coming from top/inside of steering wheel.
If you have driver side airbag, you'd best look up the safety and disablement of that before you tear into replacing the switch.

Mlx50man · November 24th, 2009, 08:01 AM

Originally Posted by WDfrmTN

If it affects high beams only:
Headlight control module, aka multi-function switch.
Check the highbeam output.
On son's '91 its a LG/BK wire.
Wire should be in bundle coming from top/inside of steering wheel.
If you have driver side airbag, you'd best look up the safety and disablement of that before you tear into replacing the switch.

Thanks man, reps!

Mr_Will · November 24th, 2009, 09:28 AM

mine just did this. I had one of the wires come out of one of the plugs in the multifunction switch. I actually just fixed this last night. I thought it was the switch but it was just 2 wires that backed out a little and lost connection. One day I want to repin those plugs I have like 5 that no longer clip in they just slid in and out.
anyone know if you can buy the pins some place

WDfrmTN · November 24th, 2009, 04:30 PM

Originally Posted by Mlx50man

Thanks man, reps!

Not a problem, man.

WDfrmTN · November 24th, 2009, 04:31 PM

Originally Posted by Mr_Will

mine just did this. I had one of the wires come out of one of the plugs in the multifunction switch. I actually just fixed this last night. I thought it was the switch but it was just 2 wires that backed out a little and lost connection. One day I want to repin those plugs I have like 5 that no longer clip in they just slid in and out.
anyone know if you can buy the pins some place

You can try Ford Fuel Injection right hand side links.

Or you can just "re-spring" the contacts with a tiny screw-driver, hairpin, etc..

86er · November 24th, 2009, 11:20 PM

if you take apart the wheel with the air bag, undo the battery, then take the fuse out for the air bag and let the modules de energize for about an hr to be safe, then you can remove the wheel/bag with out any problems. Just be sure not to use a volt meter on anything that sends a signal to the air bag b/c the few volts a meter uses to test will set the air bag off

Mr_Will · November 25th, 2009, 09:28 AM

I can pull the multi function switch out of my car without removing the wheel. Remove the steering shroud and loosen the bottom panel and you can get it out. I have done it a few times now. The first time I done it I took it all apart and realized I can do it without removing the wheel.

November 23rd, 2009, 08:15 AM	#1
Mlx50man Enthusiast 90 Mustang lx Boss 347 Join Date: Aug 2007 Location: Lakeland, FL Posts: 505 iTrader: 0 reviews	head light, brights not working. hey guys so heres my problem. My headlights work but when i go to flash the brights or just turn the brights on the lights go completely out. is it a fuse or could it be possible that the high beam on both bulbs went at the same time????? if its a fuse could you tell me which one? __________________ BOSS 347

November 23rd, 2009, 12:01 PM	#3
Mlx50man Enthusiast 90 Mustang lx Boss 347 Join Date: Aug 2007 Location: Lakeland, FL Posts: 505 iTrader: 0 reviews	ya thats what i was thinking, its just weird that they both went out at the same time you know. __________________ BOSS 347

November 23rd, 2009, 04:02 PM	#4
WDfrmTN Regular 1991 Mustang 5.0 Join Date: Nov 2009 Location: West Tennessee Posts: 127 iTrader: 0 reviews	Headlight control module, aka multi-function switch. Check the highbeam output. Year & model? __________________ "Seek to understand before you seek to be understood." Unknown "Life's tough...it's even tougher when you're stupid" John Wayne

November 23rd, 2009, 07:44 PM	#6
Mlx50man Enthusiast 90 Mustang lx Boss 347 Join Date: Aug 2007 Location: Lakeland, FL Posts: 505 iTrader: 0 reviews	Its a 90 5.0L lx ok so is it the actuall switch? cuz when i go to turn them on it just turns the lights out completely. __________________ BOSS 347

November 24th, 2009, 12:32 AM	#7
WDfrmTN Regular 1991 Mustang 5.0 Join Date: Nov 2009 Location: West Tennessee Posts: 127 iTrader: 0 reviews	If it affects high beams only: Headlight control module, aka multi-function switch. Check the highbeam output. On son's '91 its a LG/BK wire. Wire should be in bundle coming from top/inside of steering wheel. If you have driver side airbag, you'd best look up the safety and disablement of that before you tear into replacing the switch. __________________ "Seek to understand before you seek to be understood." Unknown "Life's tough...it's even tougher when you're stupid" John Wayne

November 23rd, 2009, 04:46 PM	#5
flyin ryan Banned Join Date: Jun 2008 Posts: 3,387 iTrader: 0 reviews	head light switches are a common failure with aero nose foxes so I wouldn't rule it out

November 24th, 2009, 09:28 AM	#9
Mr_Will Awesome Sauce 92 Mustang LX Join Date: Nov 2009 Location: Nederland, TX Posts: 146 iTrader: 0 reviews	mine just did this. I had one of the wires come out of one of the plugs in the multifunction switch. I actually just fixed this last night. I thought it was the switch but it was just 2 wires that backed out a little and lost connection. One day I want to repin those plugs I have like 5 that no longer clip in they just slid in and out. anyone know if you can buy the pins some place __________________ U.S. Army Retired Owner: Crankgoboom Racing James G. Bilkey - "You will never be the person you can be if pressure, tension, and discipline are taken out of your life."

November 24th, 2009, 11:20 PM	#12
86er I Post Entirely Way Too Much Join Date: Nov 2006 Location: Memphis, TN Posts: 7,626 iTrader: 0 reviews	if you take apart the wheel with the air bag, undo the battery, then take the fuse out for the air bag and let the modules de energize for about an hr to be safe, then you can remove the wheel/bag with out any problems. Just be sure not to use a volt meter on anything that sends a signal to the air bag b/c the few volts a meter uses to test will set the air bag off __________________ Just a truck 5.4 3v: 264hp 317ft lbs rock stock The "search" button, its not just for porn piecing together the next project faster than your first sexual experience

November 25th, 2009, 09:28 AM	#13
Mr_Will Awesome Sauce 92 Mustang LX Join Date: Nov 2009 Location: Nederland, TX Posts: 146 iTrader: 0 reviews	I can pull the multi function switch out of my car without removing the wheel. Remove the steering shroud and loosen the bottom panel and you can get it out. I have done it a few times now. The first time I done it I took it all apart and realized I can do it without removing the wheel. __________________ U.S. Army Retired Owner: Crankgoboom Racing James G. Bilkey - "You will never be the person you can be if pressure, tension, and discipline are taken out of your life."

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