Question about 2004 Dodge Ram 1500

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High beams are dim

Checked voltage at headlight & had 9 volts green wire. But go to ground on body I get 12 volts. I was hoping you might know where my grounding problem might be.

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Follow your wiring harness and you will find the groun wire for the headlights normally it is real close to the headlights mounted to radiator support or inner fender

Posted on Feb 21, 2009

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High beams not working


Two possibilities: both high beam lamps are burned out, or the high beam switch is bad. Also check the headlight ground wire where it connects to the car body. If the connection is corroded, the extra current load from the high beams could reduce the voltage on the lights enough to dim them significantly.

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2003 ford taurus has a head light that is dim . i checked the wires with a meter and i get 12 volts from side two side and middle wire gets nothing. because i can read 12 volts does that mean the ground is...


That sounds like you have 1 ground wire, 1 wire for the low beam, and 1 wire for the high beam. If the car has the standard halogen headlight bulb I would recommend replacing it and seeing if that fixes the problem.

Dec 20, 2011 | 2003 Ford Taurus

1 Answer

I have a dim headlight on my passenger side .This is on both low beam and high beam.I replaced the bulbs and the problem is still there.


Sounds like a bad ground. Newer cars have a dedicated ground wire going to the headlight plug. Could be broken, could be corroded. Check the wires with a simple 12 volt tester. Hope that helps

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1 Answer

I have a 2008 f250. one headlight (driverside) low beam is not working. I have checked both fuses 10amp and they are good. The flash to pass works and both lights on bright, right and left come on. the...


I am sure that a 12 Volt bulb means it needs 12 Volts. Since you changed the bulb to the other side, why not check the voltage in the working side and see what it reads?

Sometimes the turnstalk can interfere with the lighting. Try pushing the Hazard switch several times and see if the headlights straighten out. I read that too much goes through the turnstalk and that using the Hazards can derail a contact inside the stalk.

If this does not help, you may need a headlight relay in the powerbox. One contact may be dirty or burned down for the wire it feeds. Unless you have a single wire feeding both low beams to the headlights, I would bet the left and right side come out directly through the relay.

Oct 20, 2010 | Ford F-250 Cars & Trucks

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My headlight is dim but i changed out the bilb but it still is dim y is that i have an 2002 buick century


What he said but in more common terms. The ground connection to the headlight is bad. Three wires run to the bulb. One is ground, one is for the high beam, other is for the low beam. The ground wire sometimes is a short wire run to a connector screwed into the body creating the ground connection. Commonly on GM cars the black is the ground, the tan is the low beam and lt green is the high beam. You can correct this by running a wire from the black wire in the heaclight connector to the battery negative terminal or chassis ground. Hope that helps

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High beam headlights quit working. Bulbs are OK.


If your getting power at the headlight wire harness, then it's going to be the bulb it self, but make sure your checking the right 12 volt terminal at the plug. There should be three terminals there, there is a ground, 12 volt low beam, and a 12 volt high beam. If both the low and high 12 volts are getting power, then it's going to be the head light bulb it self that has reached the end of it's life time since the day time running lights are always on which is the high beams. Good luck and check the fuse box under the hood by the battery. 

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1 Answer

Driver's side high beam shorted out.


Take a test light or volt meter and unplug electrical connector at high beam light and with key on and headlight switch on (highbeem on) you should have power at dark green and white wire. If not then check 15 amp headlamp fuse. There is one for left and one for right. They are located at underhood fuse block (left fenderwell).Lift cover and look in cover for description. If there is power at headlight green/ wt wire then check for ground at the other wire black and purple.If no ground could have bad headlamp ground relay located at body relay box (left side of dash) or the ground connection for this relay a black wire located at left side of dash. Joe ASE Master Tec

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