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post #1 of 11 Old Apr 23rd, 2007, 8:16 pm Thread Starter
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another low beam problem/question

The low beam on my '99 LT quit this morning at 5:30 (fortunately in the garage before I left) and I believe it is the original - 60K miles. The previous owner of the LT had installed a headlight modulator, not my favorite accessory, but I live with it, mostly off. Anyway, before I send off for HID, I replaced the bulb today with the standard BMW replacement, but it doesn't work either, and the original bulb appears to be OK. I tried to bypass the modulator and plug it in as it was originally intended, but still no light on low. The high beam still works but no longer modulates. Any thoughts on where I should look next?

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post #2 of 11 Old Apr 23rd, 2007, 9:51 pm
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another low beam problem/question

Do you still have the old bulb? If so, is it actually burned out?

I'd start by checking the fuses. Your manual should tell you which one is for the headlight.

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post #3 of 11 Old Apr 23rd, 2007, 10:01 pm Thread Starter
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old bulb did not look burned out, I gave the fuses a quick look and did not see one that looked bad. Is there a separate fuse for high and low?

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post #4 of 11 Old Apr 23rd, 2007, 10:06 pm
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Question

Quote:
Originally Posted by gr8fulfred
The low beam on my '99 LT quit this morning at 5:30 (fortunately in the garage before I left) and I believe it is the original - 60K miles. The previous owner of the LT had installed a headlight modulator, not my favorite accessory, but I live with it, mostly off. Anyway, before I send off for HID, I replaced the bulb today with the standard BMW replacement, but it doesn't work either, and the original bulb appears to be OK. I tried to bypass the modulator and plug it in as it was originally intended, but still no light on low. The high beam still works but no longer modulates. Any thoughts on where I should look next?
Just a thought... How did you check the modulator? Was that in your garage, where perhaps the light sensor "thought" it was no longer daylight and it should no longer modulate? (i.e. too dark)
In the stock headlight the ground is common to both high and low beams, but I am not certain if this is still true with a modulator in place. Is it possible to bypass the modulator altogether and see what works and what doesn't?
I agree with your concern that if the low beam does not work now, it won't work with HID either until you resolve the issue.

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post #5 of 11 Old Apr 23rd, 2007, 10:12 pm Thread Starter
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When I checked the high beam it was still light out, my garage faces west and the sun was shining in it, so it should have modulated but did not. I did try to bypass the modulator and still got no low beam, so now I'm thinking maybe a fuse?

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post #6 of 11 Old Apr 23rd, 2007, 10:21 pm
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Quote:
Originally Posted by gr8fulfred
When I checked the high beam it was still light out, my garage faces west and the sun was shining in it, so it should have modulated but did not. I did try to bypass the modulator and still got no low beam, so now I'm thinking maybe a fuse?
Definitely not a fuse.
Have you tried connecting a voltmeter at the lead end by the bulb? If there is voltage then your issue just may be a bulb, or a bad ground.
If there is no voltage then you may have a loose or cut wire feeding the low beam.

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post #7 of 11 Old Apr 23rd, 2007, 10:25 pm Thread Starter
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Thanks. I'll dig out my voltmeter and try that.

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post #8 of 11 Old Apr 23rd, 2007, 11:18 pm
 
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My guess would be a corroded connection at (or near) the bulb socket. You will probably find that the wire is brittle for about 3/4 of an inch before the connection so some splicing will be required.
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post #9 of 11 Old Apr 24th, 2007, 7:04 pm Thread Starter
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Being the highly intelligent person I am, always sharp and aware of all things going on around me, I finally realized the parts sales clerk sold me the high beam instead of the low, and I have believed it to be the low beam all this time. So, I kept installing and removing it, checking all the connections, swearing like a drunk sailor at the bike, threatining to trade her in on a Gold Wing, etc., and not until I had removed it for about the 20th time did I realize that the high beam bulb was now no longer in the headlight and was instead in my hand. Back to A&S tomorrow to vent my wrath on the unsuspecting parts counter clerk (and don't you warn him Ted) and get the correct bulb. This time I can easily see that the old bulb is indeed bad and I am sure the problem will be corrected with a new one. The one good thing in all this, aside from advice from the great people on this forum, is that I removed the headlight modulator. I never really liked it anyway. So, thanks again for all the help, but I thought you might like to know it was operator error all along.

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post #10 of 11 Old Apr 24th, 2007, 7:16 pm
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FYI: the '99 doesn't have fuses for the headlights.



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post #11 of 11 Old Apr 26th, 2007, 6:03 am
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Being the highly intelligent person I am, always sharp and aware of all things going on around me........
Fred, don't even sweat it. Once, my own shadow even snuck up on me! AND I hadn't even had so much as one of those ICE COLD Guinness's yet!!

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