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Old 04-10-2014, 12:13 AM   #1
Garbels90
Scooby Newbie
 
Member#: 322129
Join Date: Jun 2012
Chapter/Region: South East
Location: Canada, ON
Vehicle:
2007 Impreza SE
Newport Blue

Default Headlight and Foglight Burning out Problem

So i know there has been a few post in regards to this problem before but i couldnt find the answers there so i thought id just start fresh.

Before i begin just to clear the air.
-I never touch the light bulbs when installing |(always use clean paper towel when handling)
-I use regular lightbulbs nothing special like high intensity bulbs that are avalible or anything (Im talking regular silverlight light bulbs)
-Yes i am using the proper headlight, read spec right out of FSM

Possibley theory
-Grounds are grudgy looking so they might have caused a short somehow and popped the bulbs

So for my fog lights i have replaced the grounds with new wire and connectors and bumped up the gauge a level. Fogs have been working well since then, im talking a generous three weeks. Usually the fogs have been popping around the one month period, i guess ill wait and see how this works out.
Headlights same thing, white powder like substance on wires and severe corossion on the back of the bulb housing.
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Old 04-10-2014, 12:18 AM   #2
Garbels90
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Join Date: Jun 2012
Chapter/Region: South East
Location: Canada, ON
Vehicle:
2007 Impreza SE
Newport Blue

Default

This is what the Fog light bulbs looked like and the old fog ground wires
[IMG][/IMG]





[IMG][/IMG]
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Old 04-10-2014, 12:22 AM   #3
Garbels90
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Join Date: Jun 2012
Chapter/Region: South East
Location: Canada, ON
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2007 Impreza SE
Newport Blue

Default

Im currently driving with one headlight out but this is what the burnt one looks like
[IMG][/IMG]

[IMG][/IMG]

As you can see here the wires are coated in a white powder too my guess is from running hot because when i unplugged them the plastic casing was charred and so brittle that it shattered when i touched it.
[IMG][/IMG]
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Old 04-10-2014, 12:36 AM   #4
satrya
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Location: Fremont, CA USA
Vehicle:
2002 GDAA
797

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Check to see if there are any drips that make it to the back of the bulb. Moisture and any particulates it carries can cause that kind of burning; not that it's necessarily the only possible cause.
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Old 04-10-2014, 09:26 AM   #5
LIChuck
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Location: Patchogue, NY
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2007 WRX Limited
UGM

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Wow that's a lot of material deposited on the glass. It looks like the bulbs had too much voltage applied. The overheated sockets suggest the same thing.

Start by checking the ground from the battery to the block is good and then check the battery to chassis ground.
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Old 04-10-2014, 10:51 AM   #6
Cougar4
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Winestone

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I suspect the trouble is with the alternator. Either some diodes have gone bad inside it causing excessive AC ripple voltage or the voltage regulator has a problem. Have the battery checked out also as it may have been damaged.
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Old 04-20-2014, 11:42 PM   #7
Garbels90
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Newport Blue

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Okay so the grounds on the fogs havent done a thing because my fogs have popped yet again as of several hours ago.
Im going to get the battery checked but i doubt there is a problem because it is new and the battery ground is fine. Im also getting my alt check out as well to narrow down the issue.
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Old 04-20-2014, 11:44 PM   #8
Garbels90
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Location: Canada, ON
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2007 Impreza SE
Newport Blue

Default

Quote:
Originally Posted by LIChuck View Post
Wow that's a lot of material deposited on the glass. It looks like the bulbs had too much voltage applied. The overheated sockets suggest the same thing.

Start by checking the ground from the battery to the block is good and then check the battery to chassis ground.
Thats what i thought too but ive checked all the volt coming through to the lights and its steady at 11.4 volts at the driverside and 11.6 on the passengerside.
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Old 08-24-2014, 09:57 PM   #9
Garbels90
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Join Date: Jun 2012
Chapter/Region: South East
Location: Canada, ON
Vehicle:
2007 Impreza SE
Newport Blue

Default

i think i have figured out the omen. i have recently plucked the engine to redo my head gaskets and there was no grounding what so ever form the engine to the chassis. where there was a ground rail the copper was missing.
ive done the heads on my friends 2.5i legacy and he had grounds on either side where as i did not. hoping this is cause the problem and will resolve my frequent changing of burned out fog lights.
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Old 08-26-2014, 10:56 AM   #10
Cougar4
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Quote:
Originally Posted by Garbels90 View Post
Thats what i thought too but ive checked all the volt coming through to the lights and its steady at 11.4 volts at the driverside and 11.6 on the passengerside.
Even though the DC voltage is a little on the low side you also need to check the AC ripple voltage. You most likely have some bad diodes inside the alternator and that is causing excessive AC ripple voltage. It also would help explain the lower DC supply voltage. When checking for AC voltage you need to make sure that the test meter blocks DC voltage, otherwise you need to place a 2ufd capacitor in series with one of the probe leads so the DC component is blocked.
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