2004.5 Drivers side headlight problem...

[JCobb]

Hello,



I have done some searching on this site, as to my problem but haven't come up with much so maybe someone can help. I just bought the truck in my sig, and when I got it home it had a rear taillight bulb out, a reverse light out, and drivers side headlight. I replaced all bulbs, and others worked but the headlight was still out. I checked all fuses, no problems. What do I do next? How do I check or diagnose that? Thanks in advance for any help.

 

[DerekW]

I would start with a wiring diagram, but since i dont have one I am sorry i cant help

 

[jhenderson]

I have also had headlight problems. Try removing the FCM from the fender side of the power dist. center and cleaning the contacts. I also had to tweak each of the top row of connector pins to make proper contact

 

[steved]

You can get the Factory Service Manual from www.hemitruckclub.com .



On the left side of the page, free for the download.



steved

 

[jelag]

Can we assume that you checked the bulb with an ohm meter and checked the pigtail with a voltmeter... . and you understand that your fingers can leave chemicals(oils) on the bulb that can shorten its life... you should never touch the glass with your fingers. .



If you've done all the above first... . than your forced to follow the trouble shooting chart in the manual...

 

[JCobb]

Headlight diagnosis...

Thanks for the quick replies, I should have wrote that yes, I did check the bulb with ohm meter, and the finger oil thing, etc. Only thing I didn't check was voltage at plug in. I should do that first, but thanks for the service manual link, that will also be a great help, I will have to check the connections on that FCM too. I will keep you guys updated to let you know what the problem is, because here in NY I need the headlight working in order for it to pass inspection.

 

[JCobb]

update...

I checked the voltage output from the bulb plug again and on the outside terminal (drivers side) I got a fluctuating voltage from 3. 0-5. 0 volts. Center terminal on the plug gave me no voltage. Other outside terminal (closest to the grille) gave me a solid 3. 5 volts.



I forgot to mention originally that the high beam works, just no low beam.



Anyhow I did check the voltage at the plug, on high beam, now outside terminal (drivers side of plug) got a solid 3. 7 volts, middle terminal, no voltage, then other outside terminal (closest to grille), I got a fluctuating voltage of 3. 0-5. 0 volts.



I checked the ohm reading of the bulb and got about . 2 ohms no matter which two terminals.



What should I try next? Does this mean that the FCM is making a good connection?

 

[JCobb]

Fixed!!...

Thanks to all who had responded, I finally bent the top row of connections on the FCM to make a better connection, and that fixed the problem. Thanks alot!!