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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1 Answer

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.

Jul 15, 2015 | Cars & Trucks

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2006 Hyundai Tycson GL Headlight Problems

Could be a defective headlight relay, Located in the fuse block in engine compartment,

Nov 29, 2012 | Cars & Trucks

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Dash lights go on and off while driving, then headlights do the same

Test the electrical circuit's ! Look at a wiring diagram so you know what wire's to test . Watch these video's , buy a DVOM - digital volt ohm meter . Learn to test so you don't listen to guesses .
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Electric Testing Techniques You Need to Know Free wiring diagrams here . Enter vehicle info. year , make , model and engine size. Under system click on lighting ,then under subsystem click headlamps . Click the search button then the blue link's . Right away in the first diagram i see the headlamp / panel dimmer switch is a input to the BCM - body control module . I mite think your first response would be to want to replace the BCM ! Reading a discription of how the lights are suppose to work may shed some light on the problem .
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn off the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain on until turned off or the battery runs dead.
The high beam indicator is illuminated when the instrument cluster receives a class 2 serial data message from the BCM that the high beams are illuminated.

Having the vehicle checked for DTC'S - diagnostic trouble codes , BCM - codes ! Need a professional type scan tool . Part stores can't read body codes , dealer or independent repair shop .

DTC B2575
When the body control module (BCM) senses a request for low beam headlamp illumination, the BCM sends a ground signal to the low beam headlamp relay through the headlamp low beam relay control circuit. The headlamp low beam relay will apply voltage to illuminate the headlamps.
DTC B2580
When the body control module (BCM) receives a ground signal from the multifunction high beam or flash to pass (FTP) switch commanding to illuminate the high beam headlamps, the BCM will energize the high beam relay by grounding the high beam relay control circuit.
DTC B2600
DTC B2610
The body control module (BCM) receives a variable voltage signal from the instrument panel (I/P) dimmer switch requesting to illuminate the illumination lamps to a desired intensity. When this occurs, the BCM directly sends a variable voltage based on the I/P dimmer switch position on the instrument panel lamps dimming supply voltage circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuit.
Voltage for the instrument panel lamps dimming supply voltage circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuits is from the TBC 2 A fuse in the instrument panel fuse block directly through the BCM to these circuits.

DTC B2620
The BCM directly sends a 5 volt reference voltage to the I/P dimmer switch which is then adjusted based on the I/P dimmer switch position and returned as a dimming return and dimming input to the BCM. The BCM uses this signal to directly control the desired level of instrument panel illumination lamp intensity.

Your best bet , take it to a qualified repair shop .

Oct 23, 2017 | 2004 Chevrolet Avalanche

2 Answers

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

2 Answers

My passenger side headlight does not work properly, and I cannot understand why. There are several oddities about it: 1. The bulb does not illuminate in low beams, but it works in high beams. 2. I've...

Did you check the ground wire for that light? Using your voltmeter, put the positive probe on the battery terminal and your negative lead to the pin/socket that provides ground for the lamp. If you are reading 0 volts, you need to check the ground wire for proper grounding.

Mar 24, 2017 | 2008 Chevrolet Cobalt

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

Jan 22, 2011 | 2003 Pontiac Sunfire

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

2 Answers

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

Jul 16, 2010 | Buick Century Cars & Trucks

3 Answers

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. 

Aug 25, 2009 | 2003 Pontiac Sunfire

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