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Old 03-05-2012, 02:59 PM   #1
DeM3n
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Default Driver's side headlight not working. Ballast?

Tried searching but couldn't really find much help. My driver's side headlight stopped working yesterday. I replaced the bulb and nothing. I switched bulbs with the passenger side, just to make sure it wasn't the bulbs, and still nothing. Checked the fuses and both were good.

There is no water/moisture, that I could see/feel. However, the ballast braided line is a bit shredded towards the end that plugs onto the bulb. The wire itself, inside the braided line, looks fine. Still, I'm not sure what else could be the problem. Any ideas? TIA!
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Old 03-05-2012, 05:15 PM   #2
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Check to see if power is getting to the ballast. If that is ok then check the ground for the bulb. If both those things are ok then the ballast would be suspect. You could try swapping them to see if that is the case.
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Old 03-05-2012, 05:24 PM   #3
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Try swapping ballasts.
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Old 03-05-2012, 05:28 PM   #4
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That wire should NOT be "shredded" or damaged in any way. It carries very high voltage and if it's in less than perfect condition it's not safe. How did that happen anyway, did you have critters living under the hood?
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Old 03-05-2012, 06:24 PM   #5
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I'll check for power to the ballast and swap if needed to test. Where is the ground for the bulb?

As for critters, I don't see how they could get in there. The battery is in the way and I had the cap screwed on tight. Not really sure how that happened.
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Old 03-05-2012, 10:01 PM   #6
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Quote:
Originally Posted by Mulder View Post
That wire should NOT be "shredded" or damaged in any way. It carries very high voltage and if it's in less than perfect condition it's not safe. How did that happen anyway, did you have critters living under the hood?
Ehh, if it's the metal braided sheathing, it shouldn't matter. It's only there to help with EMI.

Now if the actual wires under the braided sheathing is chewed up, then there will be problems.
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Old 03-05-2012, 10:44 PM   #7
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bulbs is grounded through the connector (to the ballast) so check the ground from the ballast.
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Old 03-06-2012, 12:01 PM   #8
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Quote:
Originally Posted by aerosaaber View Post
bulbs is grounded through the connector (to the ballast) so check the ground from the ballast.
Is that the yellow wire?
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Old 03-06-2012, 08:40 PM   #9
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I have no idea, every ballast is (likely) different.
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Old 03-06-2012, 11:32 PM   #10
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Quote:
Originally Posted by aerosaaber
I have no idea, every ballast is (likely) different.
I've been searching and it appears as that is what the yellow wire is for mine. I'm getting a DMM tomorrow and should be able to check for power. I'll update the thread when I know more.
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Old 03-07-2012, 06:47 AM   #11
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That seems like a bad idea if you don't know what you're doing.

I still say just swap the ballasts around and see if it is actually the ballast.
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Old 03-07-2012, 12:05 PM   #12
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Quote:
Originally Posted by Cougar4 View Post
Check to see if power is getting to the ballast. If that is ok then check the ground for the bulb. If both those things are ok then the ballast would be suspect. You could try swapping them to see if that is the case.
Quote:
Originally Posted by aerosaaber View Post
bulbs is grounded through the connector (to the ballast) so check the ground from the ballast.
Okay, so I tested the ground on both the ballast side and bulb side and it was fine.

I tested the power from the wire coming into the ballast (from the car) and it had 12v.

I'm suspecting ballast.

Quote:
Originally Posted by infinite012 View Post
That seems like a bad idea if you don't know what you're doing.

I still say just swap the ballasts around and see if it is actually the ballast.
It actually wasn't too bad. I had my brother in law help, who's more apt in the electrical area than me. Only thing I didn't do was swap the ballasts due to lack of time. With the tests I just did I'm really hoping it's just the ballast.
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Old 03-07-2012, 12:10 PM   #13
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If the ground is good like you say and the bulb an connection to it is alright then the ballast should be the problem.
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Old 03-10-2012, 04:20 PM   #14
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Alright, so the ballast is set to arrive today. However, my light came driver's side headlight started working again today...out of the blue. I didn't do anything to mess with it since I tested it. We did have a few days without rain so I'm wondering if maybe water was causing some kind of issue and everything just dried up?
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Old 03-10-2012, 08:00 PM   #15
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that could be possible, but usually water inside electrical things +12 volts = shorted connections and "no more worky"

If it was related to moisture in there, you'll want to find the source/seal it up to prevent it in the future. You might want to just replace the ballast anyway?

Recheck all the connections to make sure there wasn't corrosion or something that might have been the problem to begin with.
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Old 03-10-2012, 10:04 PM   #16
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Quote:
Originally Posted by aerosaaber View Post
that could be possible, but usually water inside electrical things +12 volts = shorted connections and "no more worky"

If it was related to moisture in there, you'll want to find the source/seal it up to prevent it in the future. You might want to just replace the ballast anyway?

Recheck all the connections to make sure there wasn't corrosion or something that might have been the problem to begin with.
Alright, thanks for the info.
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