headlight "surge" - BMW Luxury Touring Community
 
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post #1 of 9 Old Oct 22nd, 2007, 4:39 pm Thread Starter
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headlight "surge"

I have an issue that I believe has been going on since I've owned my LT,(purchased 03 with 30,000, now has 52,000).
I normally don't do alot of night riding, on my last trip I had the ocassion to do quite a bit. I notice that the headlights surge brighter somewhat randomly, its almost as though I can hear a relay is clicking when this occurs. I would estimate the increase in brightness to be about 20% when this occurs. As I said, I believe it has done this since I've owned, with standard bulbs and most recently an HID low beam bulb. It's hard to distinguish whether both hi and lo are doing it, or just the low beam. It is much easier to see when they "click" higher but don't know which is right, it is also kind of hard to tell how much it fluctuates back and forth.
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post #2 of 9 Old Oct 22nd, 2007, 5:12 pm
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Quote:
Originally Posted by alanforn
I have an issue that I believe has been going on since I've owned my LT,(purchased 03 with 30,000, now has 52,000).
I normally don't do alot of night riding, on my last trip I had the ocassion to do quite a bit. I notice that the headlights surge brighter somewhat randomly, its almost as though I can hear a relay is clicking when this occurs. I would estimate the increase in brightness to be about 20% when this occurs. As I said, I believe it has done this since I've owned, with standard bulbs and most recently an HID low beam bulb. It's hard to distinguish whether both hi and lo are doing it, or just the low beam. It is much easier to see when they "click" higher but don't know which is right, it is also kind of hard to tell how much it fluctuates back and forth.
Sounds like possibly a loose connection at the light socket or at the battery posts or a bad voltage regulator. But most likley it is an old tired battery. Try the connections first and if you can not remember when the battery was changed I would suggest a new one.

Gene
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post #3 of 9 Old Oct 22nd, 2007, 8:06 pm
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Check the battery.

Many years ago had a motorcycle that used a generator to charge the battery. Knew that battery was low on water but it started and ran so I just rode it. One evening after consuming a quart or two of beer was riding it a little hard and got the rpms a little higher than usual, the generator got right with it, not enough battery to absorb the generator output, blew every bulb on the machine that was on at the time, all except low beam and the stop light.

B D R
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post #4 of 9 Old Oct 23rd, 2007, 8:21 am
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Could be a weakening ground that is responding to the alternator clicking off and on as it cycles? Or could just be the alternator cycling. Like Gene said, could be battery related, especially if you;re still on the OEM battery ( I am).

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post #5 of 9 Old Oct 23rd, 2007, 10:56 am Thread Starter
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Perhaps the grounding would be a good place to start, the battery is an Odyssey which was replaced about a year and a half ago. I'll try to pay more attention, but I'm pretty sure I can hear a clicking noise when this occurs. Is there a headlight relay that could be to blame? Everything else ,(electrically), seems to be working fine on the bike.
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post #6 of 9 Old Oct 24th, 2007, 6:50 am
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It would seem to me that if the it were a headlight relay that it would be on or off, not changing brightness. Relays are either open or closed, I think (?). Check that ground first and go from there. I've read many stories here about grounding gremlins.

Good luck.
Randy
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post #7 of 9 Old Oct 24th, 2007, 11:12 am
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...unless you are hearing some other relay opening/closing that is causing a drain on the system.. Do you have any other electronics (consumer-added) that might be turning on/off at odd times?

Just a guess....

AJ
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post #8 of 9 Old Oct 24th, 2007, 3:12 pm Thread Starter
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Quote:
Originally Posted by Lost_but_Happy
...unless you are hearing some other relay opening/closing that is causing a drain on the system.. Do you have any other electronics (consumer-added) that might be turning on/off at odd times?

Just a guess....
Good point, as I think aloud... Gerbings thermostat- usually off, Piaa with on/switch utilizing signal button, Soundgate(mounts between CD changer and stock harness to facilitate audio out functions).
I usually run without the topbox, so connectors for rear speakers,etc are unhooked. I need to think this thru.....Thanks to all
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post #9 of 9 Old Oct 26th, 2007, 12:41 pm
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Surging lights?

I also have an 03 and had the same problem. I cleaned every ground I could find and have not had any additional problems.

Mike Riley
'03 Graphite Met
AMA, IBA
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