Go Back   F150online Forums > Body > Electrical Systems
Sign in using an external account
Register Forgot Password?


Electrical Systems SPONSORED BY:

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 04-12-2011, 01:20 AM
Member
 
Join Date: Nov 2010
Location: san antonio, texas
Vehicle: 2004 Ford F150
Posts: 39
headlights turning off and on while driving

My headlights have been acting really weird the last couple of days. First time I noticed it was when I had to drive to school and the headlights would shut off when i would turn on the blinker. Then they would come back on when I turned the blinker off. Really weird I know. Well tonight I had to use my fog lights to get back home because the headlights didn't even turn on. luckily I had upgraded my fogs to brighter lights and there were no cops. What's wrong with my headlights and or wiring system lol

Thanks!
Reply With Quote
  #2  
Old 04-12-2011, 03:49 AM
Senior Member
 
Join Date: Nov 2006
Location: So. Cal.
Vehicle: 2004 Ford F-150
Posts: 2,068
258- Is it BOTH the high AND low beams, or just the low beams? It sounds like a broken wire going from the MFS (multi-function-switch) to the fuse junction box. The MFS is on the turn signal arm. Take the cover off below (between the steering wheel and the dash) the steering column and check the wire loom to see if you have damaged wires there.
Reply With Quote
  #3  
Old 04-12-2011, 01:49 PM
JackandJanet's Avatar
Global Moderator &
Senior Member
 
Join Date: Aug 2007
Location: Among javelinas and scorpions in Zoniestan
Vehicle: 2005 Ford F150
Posts: 5,764
Code, I haven't really looked at the wiring for headlights on our trucks, but I had a similar problem once upon a time in an old Mercury. I was driving to work one dark morning and the headlights went off, came back on, and repeated this behavior. I discovered a damaged wire (insulation worn that was letting the wire short to ground). This caused the headlight circuit breaker to trip. Then it would reset and the process would repeat.

I imagine worn insulation in the vicinity of the multi-function switch would present similar symptoms, rather than a "broken wire".

I'm not nit-picking here, but a broken wire is easy to spot. A damaged one may take some careful inspection.

- Jack
__________________

2005 KR 4x4 SCrew 5.4, "Gott's" style CAI, PHP Gryphon CTS Tuned
Reply With Quote
  #4  
Old 04-12-2011, 02:24 PM
Technical Article Contributor
 
Join Date: Jun 2002
Location: Under the flightpath of ORD 22R
Vehicle: 2006 FORD F150
Posts: 10,279
Jack,

Close, but the headlamps ( either the feed to the main headlamp switch or the individual L & R lows and high beams ) are on fuses, so if they blew, they would not work until the fuse is replaced. No more circuit breaker.

I would go out on a limb, and say the MFS itself ( the contacts in it ) could be the cause of the symptoms. If the contacts are a bit wonky in the MFS switch, turning a directional on could have an impact on them ( this is the contacts from the high / FTP to low operation ).

Try as you may, you are not going to out dumb post me, I'm the KING !!!
Reply With Quote
  #5  
Old 04-12-2011, 03:00 PM
JackandJanet's Avatar
Global Moderator &
Senior Member
 
Join Date: Aug 2007
Location: Among javelinas and scorpions in Zoniestan
Vehicle: 2005 Ford F150
Posts: 5,764
Doesn't stop me from trying, SSCULLY! (Thanks for setting me straight though.)

Seems the multi-function switch is the "root of a lot of evil", isn't it?

- Jack
Reply With Quote
  #6  
Old 04-13-2011, 05:47 AM
Senior Member
 
Join Date: Nov 2006
Location: So. Cal.
Vehicle: 2004 Ford F-150
Posts: 2,068
Quote:
Try as you may, you are not going to out dumb post me, I'm the KING !!!
You're the KING Steve, but not the KING of DUMB! That's my story, and I'm stickin' to it!
Reply With Quote
  #7  
Old 04-13-2011, 05:50 AM
Senior Member
 
Join Date: Nov 2006
Location: So. Cal.
Vehicle: 2004 Ford F-150
Posts: 2,068
Quote:
Originally Posted by JackandJanet View Post
Doesn't stop me from trying, SSCULLY! (Thanks for setting me straight though.)

Seems the multi-function switch is the "root of a lot of evil", isn't it?

- Jack
Jack, when the auto manufacturers bought into the fuse makers business, they quite putting "breakers" in the headlight systems.
Reply With Quote
  #8  
Old 04-13-2011, 11:58 AM
JackandJanet's Avatar
Global Moderator &
Senior Member
 
Join Date: Aug 2007
Location: Among javelinas and scorpions in Zoniestan
Vehicle: 2005 Ford F150
Posts: 5,764
Quote:
Originally Posted by code58 View Post
Jack, when the auto manufacturers bought into the fuse makers business, they quite putting "breakers" in the headlight systems.
Shows how "out of touch" I am, doesn't it? :o (I've actually never had any problem with headlights since that incident, so there was no reason to study the way they were wired. The circuit breaker seemed a good idea to me at the time. I at least had headlights for part of the trip.)

- Jack
Reply With Quote
  #9  
Old 04-14-2011, 04:44 AM
Senior Member
 
Join Date: Nov 2006
Location: So. Cal.
Vehicle: 2004 Ford F-150
Posts: 2,068
Quote:
Originally Posted by JackandJanet View Post
Shows how "out of touch" I am, doesn't it? :o (I've actually never had any problem with headlights since that incident, so there was no reason to study the way they were wired. The circuit breaker seemed a good idea to me at the time. I at least had headlights for part of the trip.)

- Jack
Jack, that was kind of tongue-in-cheek, but probably more truth than fiction there. Seems like money motivates EVERYTHING anymore.
Reply With Quote
Old 04-14-2011, 04:44 AM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


All times are GMT -4. The time now is 05:24 AM.





This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
 
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details