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Old 01-28-2003, 09:07 PM   #1
popnGEAR
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Unhappy Lighting problem, help plese.

Since October my driver side headllight bulb hasn't been lighting up very very dim and I just assumed the bulb was half dead or something. One of my friends saw it and told me that it probably wasn' the bulb and that it was most likely a melted harness. I got that checked at a dealership and they saw no visible electrical problems and said they required further diagnosis (I coudln't do it because i had to leave and get back to work). When I got home today I swapped driver side bulb with passenger and vice versa and here's what happens..

If both of the bulbs are in their original position then:
driver = dim
passenger = ok

If I swap then:
driver = dim
passenger = dim

If only one bulb is in on either side then it won't light up period.

Now I've put the bulbs back to their original position and driver side doesn't light up at all now.

I'm using PIAA H4 Superwhites.

Thanks in advance.
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Old 01-28-2003, 11:45 PM   #2
BillJC
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dim lights suggest a bad ground some where. check to make sure the system is properly grounded.
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Old 01-29-2003, 08:17 AM   #3
Mulder
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Check both bulbs carefully for a blown filament (there are two in each bulb) and also check your headlight fuses, there is a separate fuse for each side.
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Old 01-29-2003, 08:23 PM   #4
SubbyRS
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Check fuses, check ground wiring....
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Old 01-29-2003, 08:34 PM   #5
popnGEAR
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any online tutorials on how to check ground wiring? i don't really know anything about it
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Old 01-30-2003, 10:36 AM   #6
rory-wrx
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Do you have a voltmeter (or can you borrow one)? If so, measure the voltage of all three headlight wires (on each side) relative to the battery negative terminal (attach the black probe to the battery negative, attach the other probe to the wire being measured) with the low beams on and then with high beams on. Also, measure the voltage across the battery. Report the results (all 13 voltage readings) back to this thread and we'll try and diagnose the problem.
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Old 01-30-2003, 03:27 PM   #7
BillJC
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You can check the voltage but, it would probably read normal. Check the ohms. If the reading is too high that means there is too much resistance in the wire and that is where your problem is. Set the scale to 0-20. If you have more than 20 ohms resistance then you have major problems.
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Old 01-30-2003, 05:13 PM   #8
rory-wrx
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Quote:
Originally posted by BillJC
You can check the voltage but, it would probably read normal
It won't if the problem is too much resistance in the circuit. Not only that, but it will tell you whether the problem is on the ground side or hot side of the circuit. Plus, it tests the whole circuit all the way back to the battery. Another bonus is that you don't have to disconnect the battery.

voltage lower than battery (+) on the hot side or voltage greater than battery (-) on the ground side is directly related to the resistance of the circuit.
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Old 01-31-2003, 03:44 AM   #9
HndaTch627
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sounds like a melted harness to me. the bulb sockets always melt. Check to see if the pins are loose inside the connector.

jeremy
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Old 01-31-2003, 04:12 PM   #10
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Quote:
It won't if the problem is too much resistance in the circuit.
That is why you test for OHM's. Ohms are the measurement of resistance. The voltage could be down for a number of reasons. Weak battery, bad regulator. bad alternator. But, resistance should be constant.
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Old 02-10-2003, 11:55 AM   #11
WRX-U
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Unhappy Huge Problems here....

..PopnGear, did you ever figure out if it was a melted harness? If so how did you fix?

Guys I have a huge problem as I have a melted drivers side harness and I think two of the positive wires touched cause now the bulb that the melted harness fits in is always dim!
Is there something really messed up, or can I fix this issue pretty easily?
Also if I order a HID kit can I solve this problem?

PLEASE HELP!!!! cause I don't have a driver side light and can't drive the car at night..

Thanks Brian
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Old 02-10-2003, 01:08 PM   #12
Alan
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Default Re: Huge Problems here....

Quote:
Originally posted by WRX-U

Guys I have a huge problem as I have a melted drivers side harness and I think two of the positive wires touched cause now the bulb that the melted harness fits in is always dim!
Is there something really messed up, or can I fix this issue pretty easily?
Also if I order a HID kit can I solve this problem?
You need to replace the socket on the driver's side, it's just a $6 part and you just cut off the old one and splice in the new one. If you get the generic BLUE aftermarket one that NAPA/Pep Boys sells it's a bit better quality than the OEM one, and cheaper.

And you need to fix this, even if you go to a HID kit.
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Old 02-10-2003, 03:10 PM   #13
WRX-U
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Thumbs up Thanks....

...So even though all of the bulbs that I have tried are dim in the drivers side, all I have to do is replace the harness and everything should be fine?

Thanks again ~B
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Old 02-14-2003, 02:22 PM   #14
momoney627
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Oh this one is easy.. Replace the fuse for the dim side headlight located in the engine bay fuse compartment..

MO$
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