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2001 fog lights not working?

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Old Feb 7, 2012 | 08:39 PM
  #11  
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Ok so just went out and tested it and when going contact to contact on the plug to the light, it gets nothing, but when I go from one contact on the plug to the bumper as ground, it gets power. But the weird part is if I put it on either plug and other to the bumper it gets the same. So a ground issue?
 
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Old Feb 8, 2012 | 09:57 AM
  #12  
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It does sound like a ground issue. The weird thing though is that they both use different grounds. One is up near the battery and other side is the "rh fender side shield."

j
 
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Old Feb 9, 2012 | 05:04 PM
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Ok thanks for the locations I will check them both out. Any specific location or just trace them?
 
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Old Feb 9, 2012 | 06:45 PM
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The two grounds are G113 and G112.

G113, on the back of the radiator support in front of the battery.
G112, back of the radiator support near the cruise control servo.

Are you reading 12 volts on both pins? Try a test light.
 
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Old Feb 9, 2012 | 08:39 PM
  #15  
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Yup both pins and just tried it with a bulb in and when jumped to the ground off the bulb, voltage drops to zero and the really clicks. I took a video I am uploading now.
 
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Old Feb 9, 2012 | 08:43 PM
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Here is the video, when it reads, it's with the switch pulled and one multimeter lead connected to positive and the other to the bumper, it reads 12v and then when the jumper is placed on the bulb and touched the bumper, it goes to 0 and the relay clicks. It's hard to hear in the video but when I touch the bumper, the relay clicks with the jumper.

http://www.youtube.com/watch?v=B9uo1...1&feature=plcp
 
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Old Feb 9, 2012 | 09:00 PM
  #17  
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OK, you're testing it with the bulb in the circuit. You are going to get a 12 volt reading, 11.93, testing it that way. There is so little resistance in the light bulb you're reading the 12 volt through the bulb. The bulb is good.

We know you've got power, but the grounds are still suspect.

Take the bulb out. Get a test light and try it from the contact in the socket the hot side, the light blue wire, to ground. See if it lights.

If it does, try the test light from the battery +12 post to the other contact in the socket, the black wire. That'll test out the grounds.

Why use the light instead of a meter? You want to put a load on the circuit and a digital meter won't do that.
 
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Old Feb 9, 2012 | 10:02 PM
  #18  
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Finally got a test light and tested it. The relay clicks like it normally does when touched to the bumper but the light does come on but very dim. Here's a video:

http://www.youtube.com/watch?v=eCO_H...1&feature=plcp

When touching the two ends of the bulb together however, nothing still happens. So it's like the really isn't fully closing or something and barely any power is getting through. But that still doesn't explain really why it gets nothing when touched at both ends of the bulb..or is it that there is something
 
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Old Feb 9, 2012 | 10:23 PM
  #19  
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you need to take the bulb out when troubleshooting.

It will be dimmer if you're passing power through the bulb to get the test light to illuminate. The test light won't draw as much power as your fog light.

It still looks like a bad ground.

If you can figure out which pin goes to the black wire, with the bulb in, you could run a wire to ground and see if the fog light works.
 
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Old Feb 9, 2012 | 10:26 PM
  #20  
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Oh whoops haha didn't know you needed to take the bulb out, I will check again, but why is the relay clicking when I go from the light to the bumper with the voltage dropping?
 
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