Dead low-beam in one headlight - Defender Source
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  #1  
Old November 13th, 2012, 06:30 PM
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Dead low-beam in one headlight

Hi guys,

OK you electrics gurus, I have no low beam in one of my headlights. Other light is fine, and switching to high beam both lights are fine. Took the offending light out and replaced the H4 bulb (twice), but no success. So it is not the bulb. Checked the wires in the back of the H4 plug, the connections all seem good and I can't see any broken wires.

About to just take it to a local garage to get fixed, but would rather sort it myself. Any suggestions?

Thanks!

Cheers,
John
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  #2  
Old November 13th, 2012, 08:52 PM
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Quote:
Originally Posted by Talleyrand
Hi guys,

OK you electrics gurus, I have no low beam in one of my headlights. Other light is fine, and switching to high beam both lights are fine. Took the offending light out and replaced the H4 bulb (twice), but no success. So it is not the bulb. Checked the wires in the back of the H4 plug, the connections all seem good and I can't see any broken wires.

About to just take it to a local garage to get fixed, but would rather sort it myself. Any suggestions?

Thanks!

Cheers,
John
Fuse?
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  #3  
Old November 13th, 2012, 08:54 PM
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Were you able to check all of the fuses? I have seen some that have a fuse for each side. On the newer Defenders they have a separate wiring loom for each wing. You can find the connector on the firewall. I would test the connection at the light to make sure you have power. If you do not have power there then go to the firewall plug and check for power there. If you don't have power there then you can keep tracing. Those wires are color coded and pretty easy to trace as long as they didn't change colors at the plugs.
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  #4  
Old November 13th, 2012, 09:08 PM
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Quote:
Originally Posted by Talleyrand View Post
Hi guys,

OK you electrics gurus, I have no low beam in one of my headlights. Other light is fine, and switching to high beam both lights are fine. Took the offending light out and replaced the H4 bulb (twice), but no success. So it is not the bulb. Checked the wires in the back of the H4 plug, the connections all seem good and I can't see any broken wires.

About to just take it to a local garage to get fixed, but would rather sort it myself. Any suggestions?

Thanks!

Cheers,
John
I know you said you looked at the wires and connections but did you check for power at the harness on the offending side?
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  #5  
Old November 13th, 2012, 09:41 PM
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Quote:
Originally Posted by Talleyrand
Other light is fine, and switching to high beam both lights are fine. Took the offending light out and replaced the H4 bulb (twice), but no success. So it is not the bulb.
Not sure what year your truck is, but i believe the standard fuse panel has a seperate fuse per headlight. have you checked the fuses?
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  #6  
Old November 13th, 2012, 09:45 PM
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http://www.reedx.net/landrover/maint...use_layout.jpg
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #7  
Old November 13th, 2012, 09:50 PM
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Any melting or burning of the plug?
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  #8  
Old February 8th, 2013, 01:24 PM
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Talleyrand did you ever find a solution to this? I have a dead low beam on the drivers side. High beams work on both sides. Just replaced the light.
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  #9  
Old February 8th, 2013, 01:55 PM
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Stone, do you have a multimeter to check for voltages on the plug? If not we can sort it out at the meetup tomorrow.
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  #10  
Old December 29th, 2013, 08:41 PM
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Samdford Wallace
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I'm having this same issue with my Tithonus Defender.

I changed the bulb and checked all fuses with no luck. What else could cause just one bad low beam? High beams work fine.
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  #11  
Old December 29th, 2013, 11:00 PM
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Quote:
Originally Posted by spammer View Post
I'm having this same issue with my Tithonus Defender. I changed the bulb and checked all fuses with no luck. What else could cause just one bad low beam? High beams work fine.
Replace the fuse. Not sure why, but that fixed mine.
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  #12  
Old December 29th, 2013, 11:23 PM
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Pretty sure they are individually fused after the switch. Check all wires and grounds.
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  #13  
Old December 29th, 2013, 11:36 PM
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Quote:
Originally Posted by Red90 View Post
Pretty sure they are individually fused after the switch. Check all wires and grounds.
I'll check that in the morning. If it's not a wire or a ground, could it be the main headlight switch (round army switch)?
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  #14  
Old December 29th, 2013, 11:54 PM
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Sometimes when the plugs go bad you can't see it. Check voltage at the plug.
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  #15  
Old September 28th, 2015, 11:25 PM
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s
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Old thread, but I got the same problem RH dim is out, LH works fine....was there ever a conclusion reached on this?
-I've checked the fuses in the passenger compartment, all light up when switched on
-Checked the relay in the fuse box, swapped with another to confirm operation
-Brights work on both side, dim works on the LH only- RH is out
-No juice to the connector on RH for the low beam, there is power to the high beam
Any other troubleshooting suggestions? I attempted to track the wire from the connector back and couldn't find it in the dark with a flashlight...
Any suggestions to troubleshoot would be appreciated. Thanks in advance.
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  #16  
Old September 29th, 2015, 12:52 AM
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On mine it was the fuse, just as everyone thought ...
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  #17  
Old September 29th, 2015, 07:58 AM
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Similar problem. End up being badly corroded ground. Only have 2,7volts to the headlamp. Check if the the dim/dip relay is bypassed!
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  #18  
Old September 29th, 2015, 08:00 AM
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Dang. I put the tester on the fuse #11-#13 and it lights up when the switch is activated. I even changed the fuse itself to another one, and got the same result. I've attached a pretty good schematic for the electrical if you have a 97 Defender and you are troubleshooting the wiring. Anyone else out there have any ideas?? Thanks
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  #19  
Old September 29th, 2015, 08:06 AM
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Get a thin prong like tool and gently prize the contacts away from the plug wall.
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I don't know about the brakes, only their unreliability.
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  #20  
Old September 29th, 2015, 08:17 AM
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?

Rocky, Are you referring to the prongs inside the slot where the fuse is inserted in the fuse panel?

Thanks for the help.

Quote:
Originally Posted by Rocky View Post
Get a thin prong like tool and gently prize the contacts away from the plug wall.
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