High Beam Burnout - Defender Source
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  #1  
Old March 10th, 2016, 02:48 PM
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Parrie Willette
1989 D90 P/U
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High Beam Burnout

During check-out on my newly aquired '89 D90 p/u I found that neither headlight had a functioning "Hi Beam". Upon further inspection I found the H4 bulbs "Hi Beams" were burnt out. I purchased and installed new H4 bulbs..."Hi Beam" worked for a couple days but then burnt out again Any thoughts on what would cause them to burn out so quickly?
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  #2  
Old March 10th, 2016, 03:53 PM
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wayne p
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Congrats on the new truck.


Just main beam? One or both? Any other bulbs burning out quickly?


Assuming you took care not to touch the bulbs w/ your fingers, I'd look at vibration first. Once had an issue w/ landing lights lasting ~5 hrs. Drove us crazy trying to find the problem. Turned out to be just a little bit of play in the mount.


Could also be high voltage from the alt, but that should affect more than just the main beams. Worth checking though.
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  #3  
Old March 10th, 2016, 04:05 PM
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Parrie Willette
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Thanks for the congrats and response Wayne. Was very careful not to touch the bulbs...Main beams are both fine...both hi-beams worked fine for a couple days then burnt out...main beams still working fine. No issues w/ other bulbs. I was thinking along the lines of a vibration issue but since the low beam are still working I ruled it out. I'm going to do a bit more head scratching...wondering if a faulty DIP switch could cause the problem?
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  #4  
Old March 10th, 2016, 04:07 PM
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John B.
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Strange. Can you verify the low beam is not running at the same time as the high beam. Perhaps there is a fault in the dip switch and leaving them both on and I would guess cause the filament to get too hot.
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  #5  
Old March 10th, 2016, 05:10 PM
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wayne p
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did the new ones burn out at the same time? did you verify that the filaments are both broken and it isn't an intermittent power supply issue?


here is a crazy long shot, but are the new bulbs from the same package/batch and may have been defective? crazy I know, BUT...I had a single intermittent high beam issue last year and in the course of chasing it found that about half of the bag of fuses I got from one of the popular suppliers were bad. The end caps of the fuses were loose and making intermittent contact. Seriously, how do you ***k up making a glass fuse in 2015? After that episode, I don't discount any potential cause no matter how far fetched...
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  #6  
Old March 10th, 2016, 07:16 PM
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They could be grounding out some place? Have you checked to see what voltage is at the plug?
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  #7  
Old March 11th, 2016, 07:01 AM
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Parrie Willette
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Had just a few minutes to check things again last night, will pull bulbs this weekend for inspection & confirm voltage. Prior to burn out they were working correctly and yes, both burnt at same time. One odd thing to add to the situation...the hi beam indicator light on the dash has also stopped working. Suppose I'll be tearing into the dash this weekend as well!
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Old March 13th, 2016, 10:56 AM
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Are your headlamps on relays?
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  #9  
Old March 13th, 2016, 07:02 PM
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Peter Stolz
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Cool truck. My guess is that if the highs and the indicator went out at the same time, the issues is not the bulbs themselves (unless you got a bad batch like Wayne suggested). Did you actually test the bulbs to see if they did in fact burn out? Maybe it's the switch. If it's like my '94 D90, they are all on the same circuit and after the switch.
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  #10  
Old March 13th, 2016, 07:12 PM
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Chris
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When I built my truck, I spec'd a relay for the HL. Three hours into a trip, I discovered that had not happened. Its fixed now and rock solid reliable
Replace the switch (cheap at Rovahfarm), add relay and motor on.
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  #11  
Old March 14th, 2016, 07:59 AM
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Parrie Willette
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Thanks for the response guys. Yep, hi beam filliment pooched. I do not believe that the lamps are on a relay...at least not one that I can see. Are we talking about a factory relay? I'm going to try one more sweep checking ground connections then probably start with a new switch.
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  #12  
Old March 14th, 2016, 08:31 AM
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Mike
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On some of the older trucks there was a voltage transformer/control unit under the right fender. It is hard to see. With out looking at the actual wiring it is hart to tell if it is there or not. Have you changed the dim dip relay?

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