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Lighting Forum
Angel Eyes, DDEs, lighted rings, Clear Turn Signals, LEDs, Xenon, HID, or Bi-Xenon. If it lights up and you want to discuss it, post here!

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Old 10-06-2012, 05:42 PM   #1
Glaede
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Flashing headlights / unstable voltage

Hi guys,

I was out driving tonight and noticed that my headlights is "flashing" - mostly my highbeams, but properly just because its easier to see. My car is not equipped with xenon or anything like that. When i say flashing its probably more like unstable voltage or something like that - like vibrant actually.

Has anyone experienced this before? Haven't been able to find anything on google.. It might be all of the electrics - I think i noticed the interior lights flash also.

Bad alternator / battery maybe?

Thanks!

Last edited by Glaede; 10-06-2012 at 05:55 PM.
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Old 10-06-2012, 06:13 PM   #2
dmax
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Use cluster test to see what voltage you have when car is off and on.

s/b around 12 v off and around 14 v when on.

Voltage is only one measure of a battery's health. If it's over 4-5 years old, might be time for a new one. Although voltage spikes when driving usually points to alt, it could just be corrosion somewhere, a loose connection...battery cable or ground.

Check the basics...use cluster test to get some measure of battery. Search SolidJake's vids for 'cluster test'
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Old 10-06-2012, 06:15 PM   #3
Glaede
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Quote:
Originally Posted by dmax View Post
Use cluster test to see what voltage you have when car is off and on.

s/b around 12 v off and around 14 v when on.

Voltage is only one measure of a battery's health. If it's over 4-5 years old, might be time for a new one. Although voltage spikes when driving usually points to alt, it could just be corrosion somewhere, a loose connection...battery cable or ground.

Check the basics...use cluster test to get some measure of battery. Search SolidJake's vids for 'cluster test'
I did actually test this once for like a month ago when i bought the car and i think it was around 13.9V when the engine is on. But yeah I'll def. test that again.
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Old 10-06-2012, 06:18 PM   #4
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You can get to voltage or any test from position 2 to see 'standing battery voltage' then start the car. 13.9V is fine...

If the battery is really weak, or bad, that might be sapping the voltage too (at least I believe it could). Also, didn't say, but if you take a lot of short trips and no long ones, your battery will get weaker and weaker. Following symptoms will include not having enough power to start the car...if cranking has been slow, that points more to battery.

GL...hth
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Old 10-06-2012, 06:22 PM   #5
Glaede
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I haven't seen anything that points in the direction of either a bad alternator or battery yet - besides the vibrant headlights.. I "hoped" it was some typical E46 easy-fix thing, but it doesn't seem so
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Old 10-06-2012, 06:32 PM   #6
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Ohh and btw the highbeam indicator in the cluster is flashing at the same time as the headlights..
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Old 10-06-2012, 07:36 PM   #7
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have you check the actual bulb? check if is loose..
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Old 10-07-2012, 10:51 AM   #8
Glaede
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have you check the actual bulb? check if is loose..
Well, I haven't yet, but do you think that could cause it?
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Old 10-10-2012, 08:04 AM   #9
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Could it be a bad ground maybe and where is it located?
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