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Old 12-03-2012, 06:19 PM   #1
ManualOverAuto
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New plug is a 9003 plug for my 2001 impreza's driver side headlight.

My question is, where do high, low, and the common wires go to on the plug? (Basically, which "pin" controls high, low, or common?)


This is the plug.

All the diagrams I've seen, and things I've read were wrong, and I'm running out of wire.

Passenger side has different color wires than drivers side, which also doesn't help.

This is what I'm working with. I already know which of the factory wires are low, high, and common. I just don't know where they go to on the plug.
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Last edited by ManualOverAuto; 12-03-2012 at 07:54 PM.
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Old 12-03-2012, 07:41 PM   #2
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ya have to use a meter to figure out what wire goes to what pin on the plug

best done before ya cut the old one off....stick a pin in the wire and check continuity
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Old 12-03-2012, 08:26 PM   #3
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Quote:
Originally Posted by Uncle Scotty View Post
ya have to use a meter to figure out what wire goes to what pin on the plug

best done before ya cut the old one off....stick a pin in the wire and check continuity
The old plug was melted and stuck on, so I had to break it off, and in the process I mixed up the wires. It was really stuck :/
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Old 12-03-2012, 08:54 PM   #4
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well ****....
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Old 12-03-2012, 10:22 PM   #5
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Use a ohmmeter to see which wire of the new plug ties to the center connection of the plug. Whatever color wire that is it needs to be tied to the power lead of the lights which is the red/blue wire. The note you show in the picture shows the wiring incorrectly according to my data for the original wiring. My data shows the low beam wire is the yel/blu wire and the high beam wire is red. The r/l power wire is correct. To figure out which contact ties to the high and low beam connection on the plug you could just look at the bulb filaments and to which contact on the bulb they would tie to. You will notice that the high beam filament is a larger size than the low beam filament. Both of the filaments will to tie the center contact for power. The other side contacts make the ground return for the light circuit.

Another way you could do it is place a good bulb in the socket then measure the resistance between the center contact wire and each of the two side contact wires. The side that shows the lowest resistance will be the high beam side and the higher resistance wire will be the low beam.

If you don't have a meter to check things with you could also just use some wire jumpers for testing various combinations of wiring configuations in order to solve the riddle. The first thing you need to know is which wire on the new plug is the common center lead for power. Once you have that and tie it to the power lead then you just need to figure out the low and high beam wires. If the low beams are turned on then whatever combination of wires makes the lower light level will be the proper connection for that side.

You can also verify the high and low beam wires on the car by checking the resistance to ground. Whichever light is supposed to be turned on, that wire will have a low resistance to ground reading.

Last edited by Cougar4; 12-03-2012 at 10:47 PM.
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Old 12-03-2012, 10:40 PM   #6
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Quote:
Originally Posted by Cougar4 View Post
Use a ohmmeter to see which wire of the new plug ties to the center connection of the plug.
Got those figure out already too.
Looking at the pin side of the plug:
Left-red
Top-blue
Right-black

Quote:
Originally Posted by Cougar4 View Post
Whatever color wire that is it needs to be tied to the power lead of the lights which is the red/blue wire.
So, the red/blue (factory) to the blue (new) which is the top pin.
If the top pin is indeed where the common goes, then I could just try the high and low wires on the left/right sides until it's correct. Switching around 2 wires, is a lot easier than switching around 3 until I get it right.

[quote="Cougar4;38625792 The note you show in the picture shows the wiring incorrectly according to my data for the original wiring. My data shows the low beam wire is the yel/blu wire and the high beam wire is red. The r/l power wire is correct. [/QUOTE]
I'll check again.
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Old 12-03-2012, 10:53 PM   #7
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Ok, it sounds like you have got it figured out pretty good. You just need to look at the bulb to see which side of the plug the high and low beam filaments tie to. The high beam filament will have a larger wire size.
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Old 12-03-2012, 11:13 PM   #8
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Quote:
Originally Posted by Cougar4 View Post
The note you show in the picture shows the wiring incorrectly according to my data for the original wiring. My data shows the low beam wire is the yel/blu wire and the high beam wire is red. The r/l power wire is correct.
Here's some numbers from about 2 minutes ago:

Battery: 12.41v

Low Beams, ON:

red/blue wire= 0.0v
yellow/blue wire= ~.35v
red wire= ~11.85v


High Beams, ON:

red/blue wire= 0.0v
yellow/blue wire= ~11.85v
red wire= ~.35v

Numbers aren't exact (hence the ~) because I did it quick, but you get the idea.

Edit: I also just tried again.

Power to the top pin, and I had the low's to the left pin, and high's to the right. High beams didn't work. I switched the high and low beam wires, and the high beam still doesn't work :/
I'll try again tomorrow, I have another idea of how I can check.

Last edited by ManualOverAuto; 12-04-2012 at 02:23 AM.
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Old 12-04-2012, 12:06 PM   #9
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I assume the voltage readings were taken with reference to ground. The voltage readings you recorded don't make sense to me unless the bulb wasn't inserted in the socket when you made the readings. The r/l wire should have voltage getting to it at all times when the headlights are on. Check the fuses in the panel under the hood. Going by the wire colors it appears you are working on the left side headlight and that should go to fuse 8 in the panel. I suspect that fuse is blown out.
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Old 12-04-2012, 12:25 PM   #10
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Quote:
Originally Posted by Cougar4 View Post
I assume the voltage readings were taken with reference to ground. The voltage readings you recorded don't make sense to me unless the bulb wasn't inserted in the socket when you made the readings. The r/l wire should have voltage getting to it at all times when the headlights are on. Check the fuses in the panel under the hood. Going by the wire colors it appears you are working on the left side headlight and that should go to fuse 8 in the panel. I suspect that fuse is blown out.
I am working on the drivers side light.

The bulb being in the socket is irrelevant, because my factory wires aren't connected to the bulb/socket/plug. Although the bulb was in the socket.

The factory wires on the right, aren't connected to anything at the moment.
I held the black tester on the negative battery terminal, then I would flip the low beams on and use the red tester to find the low's. Did the same with high beams, and got the numbers I posted above.

Last edited by ManualOverAuto; 12-04-2012 at 01:13 PM.
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Old 12-04-2012, 03:06 PM   #11
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Okay, so the measurements were made with the circuit unteminated and that is what I though had be in order to get those readings. The fuse for that side is either blown out or the r/l wire has a break in it. Power should be tied to that wire when the lights are on. Once that is fixed you should be good. The low .35 volt readings you got seem to show the connection to ground is ok, as long as the voltage stays that low when the light is working.
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Old 12-04-2012, 03:18 PM   #12
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Ha! There was a fuse blown, which definitely happened when I was attempting to wire the new plug. I also cleaned up a few grounds.

Now, I'm checking the old (passenger side) plug to see which pin goes to what.
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Old 12-04-2012, 03:59 PM   #13
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When you get the wiring figured out please let us know which wires of the new socket the are used for for the high and low beams. This will help others in the future.
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Old 12-04-2012, 09:22 PM   #14
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Ok I got it all figure out and fixed.

The blown fuse was making those voltage readings wrong from when I initially tested the factory wires.

After i put in the new fuse, I was checking the pins on the old plug (passenger side) to check for high and low, but I found one of the pins broken. So I went ahead and replaced that plug. That was easy because I saw the old wiring before I cut the wires off.

I used how the passenger side was wired up, on the drivers side and surprisingly it worked.

Ill put up the rest of the info later when I go back and look at it. Pretty sure the common was the yellow/blue wire for both, driver and passenger side and it went to the top connector. Also, when the low beams are on, the other 2 wires both get 12.4 v, but when the high beams are on, only one wire gets the 12.4 v

I explain more later, just glad I got it figured out.
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Old 12-04-2012, 11:54 PM   #15
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So, to be honest, I still couldn't tell you guys which pin controls what. For the passenger side I used the wiring in the old plug for reference. Then I used that wiring (passenger side), the meter, and matched the wires for the drivers side based on the numbers the passenger side made during high or low beam operation (hope that made sense).

Now, I know (hope) if I give you guys the numbers from both plugs during high beam and low beam, you can tell which pin controls what. Here goes.......


This is the way I am viewing the plug, and if you can't see the picture, it's the "pin" side, not the wire side. Just for reference so you know which left and right I'm talking about, haha.

---Drivers Side Plug---

Low Beams, ON:

-Left Pin = 12.4 v
( Red wire)
-Top Pin = 0.0 v
( Yellow/Blue wire)
-Right Pin = 12.4 v
( Red/Blue wire)


High Beams, ON:

-Left Pin = 0.0 v
(Red wire)
-Top Pin = 0.0 v
(Yellow/Blue wire)
-Right Pin = 12.4 v
(Red/Blue wire)


---Passenger Side Plug---

Low Beams, ON:

-Left Pin = 12.4 v
(Red wire)
-Top Pin = 0.0 v
(Yellow/Blue wire)
-Right Pin = 12.4 v
(Blue/White wire)


High Beams, ON:

-Left Pin = 0.0 v
(Red wire)
-Top Pin = 0.0 v
(Yellow/Blue wire)
-Right Pin = 12.4 v
(Blue/White wire)

Last edited by ManualOverAuto; 12-04-2012 at 11:59 PM.
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Old 12-04-2012, 11:56 PM   #16
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The common power wire for the driver side should be the red/blue wire. You should see power on that lead at all times when the lights are on. After looking at some data for the lamps it shows that the common lead to the filaments isn't always the center contact of the socket though in this case it may be.
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Old 12-05-2012, 12:06 AM   #17
ManualOverAuto
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Quote:
Originally Posted by Cougar4 View Post
The common power wire for the driver side should be the red/blue wire. You should see power on that lead at all times when the lights are on. After looking at some data for the lamps it shows that the common lead to the filaments isn't always the center contact of the socket though in this case it may be.
Yea so it's:
Left= low
Top= common
Right= high

????

It's already wired up and working, I just wanna know haha.
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Old 12-05-2012, 12:07 AM   #18
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The voltages you show make sense. Notice that the r/l wire always has power to it no matter which light is on. That is the common fused power lead but it isn't tieing to the center contact of the plug like I thought it should have earlier. This is one of those lights that doesn't use the center contact for the common connection.

The lamp that is turned should have no voltage on the return lead since that ties to ground through the light switch and the lamp that isn't working will show voltage on it because the return lead is open and not making connection to ground. Therefore it will have the supply voltage on it that passes through the filament wire.
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Old 12-05-2012, 12:09 AM   #19
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Just saw your new post. Maybe the r/l wire is in the center.
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Old 12-05-2012, 01:14 AM   #20
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Quote:
Originally Posted by Cougar4 View Post
Just saw your new post. Maybe the r/l wire is in the center.
Yellow/Blue wire is in the center. Both driver and passenger side have a yellow/blue wire, and both go to the center or top, pin. Both also have a plain red wire that goes to the left pin. Only difference is the red/blue wire on the drivers side, and the blue/white on the passenger side, both go to the right pin.
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Old 12-05-2012, 11:49 AM   #21
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The common power lead for both sides ties to the right side pin. The low beam wire is in the middle.
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Old 12-05-2012, 12:30 PM   #22
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Quote:
Originally Posted by Cougar4 View Post
The common power lead for both sides ties to the right side pin. The low beam wire is in the middle.
So the yellow/blue wire that goes to the center pin (both sides) is the low beam?
Why doesn't it show any voltage?

Last edited by ManualOverAuto; 12-05-2012 at 01:43 PM.
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Old 12-05-2012, 02:20 PM   #23
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The reason is because the lights are turned on by making a ground connection to the light rather than providing a power connection. Power is provided to both of the filaments anytime the light switch is turned on (the common lead) and ground is provided to the middle lead (when the low beams are selected) through the light switch. So the voltage potential on that pin (the middle pin)should be the same as the meter reference lead that is tied to chassis ground. If there is no wiring losses or bad connections for the load current to make a voltage drop to the result is zero volts.
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Old 12-05-2012, 03:52 PM   #24
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Hmm, interesting. Thanks! Good to know.
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