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Old 09-12-2002, 01:28   #1 (permalink)
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Help: Headlight keeps blowing

Ok, this is strange...

My headlight has just blown again. It first blew a fair few weeks ago. So I replaced it, which blew again a week or so later. Now, a week or so after replacing it again, its blown again!

I'm taking care not to touch the bulb (etc, etc) but it still keeps blowing. I'm starting to think the wire attachment thingy might be arcing over bad conducting, as it seems to be covered in a fair amount of carbon-like muck. The other possibility I've thought of is it might be getting wet and then shorting

Does anyone have any ideas what might be wrong?
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Old 09-12-2002, 06:27   #2 (permalink)
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What type of car/headlight are we talking?
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Old 09-12-2002, 06:37   #3 (permalink)
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if it was shorting out, i'd assume it would blow a fuse...

Maybe try and clean all that carbon-like muck up, and see how you go then.

And your not trying to use brighter globes are you? standard ones should be 55/60

Another thing maybe its getting to hot??
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Old 09-12-2002, 15:53   #4 (permalink)
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Re: Help: Headlight keeps blowing

Quote:
Originally posted by Wazza80-99
Ok, this is strange...

My headlight has just blown again. It first blew a fair few weeks ago. So I replaced it, which blew again a week or so later. Now, a week or so after replacing it again, its blown again!

I'm taking care not to touch the bulb (etc, etc) but it still keeps blowing. I'm starting to think the wire attachment thingy might be arcing over bad conducting, as it seems to be covered in a fair amount of carbon-like muck. The other possibility I've thought of is it might be getting wet and then shorting

Does anyone have any ideas what might be wrong?
how much care are you taking to make sure you dont touch the glass?

if it touches any part of your skin, or anything for that matter, wiping it with even a dry rag isnt going to help. I had this problem before, and had to be extremley careful, and if it accidently touched absolutly anything, i cleaned it with isopropyl alcohole. after that, my 3rd encounter, it never blew again.
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Old 09-12-2002, 19:40   #5 (permalink)
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55/60, whoa

I have been putting in a 12v 100w bulb!!! it's what I took out when the first one blew. I guess thats why it keeps blowing. I'll take out the other bulb and see what it is.

ok, everyone gets one free swing at the newbie... no seconds! heheh
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Old 09-12-2002, 20:21   #6 (permalink)
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ummm you should be able to put in 90/100 without doing any wiring or fuse upgrades. However, if you go to the 100/110 level, you may need a slight upgrade on power requirements. So, I'd lean towards checking all your wiring for shorts, cause that's what it sounds like.
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Old 09-13-2002, 06:35   #7 (permalink)
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Quote:
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ummm you should be able to put in 90/100 without doing any wiring or fuse upgrades. However, if you go to the 100/110 level, you may need a slight upgrade on power requirements. So, I'd lean towards checking all your wiring for shorts, cause that's what it sounds like.
Excuse my ignorance, but how on earth does a short cause a car headlight globe to blow??? it doesn't
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Old 09-13-2002, 07:43   #8 (permalink)
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your right, mp3kid. It shouldn't cause the globe to blow, but blow a fuse or trip a circuit breaker.

As for the wattage, if your using that 100w then that explains why they keep blowing. Using a brighter bulb will create more heat, thus needing a more efficient cooling and wiring to suit it.

Also i noticed that if you do go the path of 90/100 like hoon said you shouldn't need any wiring upgrades. But if you buy cheap globes then they wont last long. And you will ALWAYS have the problem of them overheating.

Save yourself money and get the proper 55/60W bulbs.

I assume your talking h4?
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Old 09-13-2002, 09:29   #9 (permalink)
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Well if my first Q had been answered it would have saved some stuffing around .... and correct diagnosis could have been given straight up .... why do we bother trying to help? Oh, I remember we're all Ford nuts and can't help ourselves.
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Old 09-13-2002, 20:02   #10 (permalink)
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thanks for the input everyone,

I thought I'd better clear things up a bit (finally), I'm driving an EL GLi

I'm pretty certain its the whole overheating issue now.

when you say 55/60, I'm assuming you are talking about the wattage?
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