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


Electrical Systems SPONSORED BY:

Welcome to F150Online Forums!
Welcome to F150Online.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the F150Online Forums community today!





Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-28-2010, 05:47 PM
Member
 
Join Date: Jan 2010
Posts: 45
How To Test Headlight Switch to see if its bad

I have a 2004 f-150 xlt and need some help testing the headlight switch to see if it is bad. i have a multimeter but suck at using it. Can anyone help with pictures or testing to see if its bad or not.

My trucks tail lights parking lights and dash lights do not work and i have no fuses blown. My fog lights only come on with the high beams. When i turn my fog light off a white light flashes on then off.Any help would be great.
Reply With Quote
  #2  
Old 01-28-2010, 06:18 PM
Technical Article Contributor
 
Join Date: Jun 2002
Location: Under the flightpath of ORD 22R
Vehicle: 2006 FORD F150
Posts: 10,264
If you have a 2004 Heritage, the, main headlamps switch test diagrams are here :
http://www.f150online.com/forums/mem...9-2003-my.html

If you have a 2004 New Body style truck, they are here :
http://www.f150online.com/forums/mem...4-2008-my.html
Reply With Quote
  #3  
Old 01-28-2010, 06:29 PM
Member
 
Join Date: Jan 2010
Posts: 45
i dont really know how to read the diagrams is there any way you could pull out your headlight switch and take pictures of how to test it or what ohms levels should be on witch wires cause i dont really know sorry to be a pain but it would really help me out.
Reply With Quote
  #4  
Old 01-28-2010, 07:08 PM
Senior Member
 
Join Date: May 2007
Location: Orlando
Vehicle: 2003 Ford Expedition
Posts: 2,101
This is the diagram you need (got from the link above, assuming you have an NBS truck).

Click the image to open in full size.

Pull the headlight switch out, disconnect the wire connector, and look for the connector that looks like the one in the diagram (one with 10 pins).

Put the multimeter in the mode selected in green (continuity test, it'll make a beeping sound if you touch the multimeter leads together).
Click the image to open in full size.

If you want to test the headlights, for example, you touch the leads to pins 6 and 1 (match them up with what the diagram shows.) If the dial is in the Auto, Off, or Park settings, the multimeter won't make a sound. If it's in the headlight setting, the multimeter should beep (and I think it will display a number close to 0?)

If you want to test the parking lamp function, connect the leads to pins 10 and 5 (the ones all the way on the right.) The multimeter will be silent if the switch is set to Auto or Off, and it will beep if it's in the Parking lamp or headlight setting.

And so on and so forth. Hopefully I described it well enough

Last edited by ELVATO; 01-28-2010 at 07:10 PM.
Reply With Quote
  #5  
Old 01-28-2010, 07:49 PM
Member
 
Join Date: Jan 2010
Posts: 45
Thank you very much scully and thank you elvato. Im a tard when it comes to electrical but, you made it very easy to undertstand. Im going out to test the switch now thanks this is exactly what i needed
Reply With Quote
  #6  
Old 01-28-2010, 09:01 PM
Member
 
Join Date: Jan 2010
Posts: 45
The only problem is mine has 12 pins and 11 wires for some reason the one in the diagram has 10. Hmm now what do i do? its a new body style 2004 xlt with 4x4 this sucks lol. I need to get the truck inspected and need to figure this out.

Last edited by steve_dowg2001; 01-28-2010 at 09:04 PM.
Reply With Quote
  #7  
Old 08-23-2010, 10:42 AM
Member
 
Join Date: Oct 2008
Location: Bakersfield, CA
Vehicle: 2008 Ford F-150
Posts: 48
Great diagram and description. Which of the pins is a 'ground'? or is there no common 'ground' pin?

Also, are ANY of these wires a 'switched power' wire?

I am looking for a switched power wire somewhere in this area of the dash to connect to my extra fog light rocker switch [yes, it is a relayed system] so that the extra fog lights lose power when either the key is out or the headlight switch is not turned to at least the park position.

Thanks.
Reply With Quote
  #8  
Old 08-23-2010, 11:19 AM
Technical Article Contributor
 
Join Date: Jun 2002
Location: Under the flightpath of ORD 22R
Vehicle: 2006 FORD F150
Posts: 10,264
Quote:
Originally Posted by bczrx View Post
Great diagram and description. Which of the pins is a 'ground'? or is there no common 'ground' pin?
There is not a ground associated with the headlamp circuits. There is one for the instrument illumination. Just take the ground wire down the driver's side kick panel to ground there.


Quote:
Originally Posted by bczrx View Post
Also, are ANY of these wires a 'switched power' wire?

I am looking for a switched power wire somewhere in this area of the dash to connect to my extra fog light rocker switch [yes, it is a relayed system] so that the extra fog lights lose power when either the key is out or the headlight switch is not turned to at least the park position.

Thanks.
The parking lamp circuit is a switched power, it is the brown wire at the back of the main headlamp switch.
Reply With Quote
  #9  
Old 08-23-2010, 04:19 PM
Member
 
Join Date: Oct 2008
Location: Bakersfield, CA
Vehicle: 2008 Ford F-150
Posts: 48
Quote:
Originally Posted by SSCULLY View Post
There is not a ground associated with the headlamp circuits. There is one for the instrument illumination. Just take the ground wire down the driver's side kick panel to ground there.



The parking lamp circuit is a switched power, it is the brown wire at the back of the main headlamp switch.


Thanks again [as I said on the other thread]

Sorry for high-jacking this thread.


UPDATE: They work fine with that wire. thanks again!

Last edited by bczrx; 08-24-2010 at 11:22 AM.
Reply With Quote
Old 08-23-2010, 04:19 PM


 
 
 
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 06:06 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