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Headlight circuit replacement - 1994 Plymouth Sundance

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  • Plymouth Master
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Fuse? harness? plug to rear of light? relay? Ya gotta post details here to get the right answer.

Posted on Jan 19, 2013

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No dash lights or tail lights


Well it could always be a wiring problem, but you were right in thinking it was the headlight switch. Each circuit is different and only joins up in the headlight switch. Each circuit has a fuse sending power to the switch. So I would want to know if you have power in and out of the headlight switch on each circuit.

Feb 15, 2014 | 2000 Pontiac Sunfire

1 Answer

No Headlights


In the late 1990s GM and most other car companies changed the configuration of headlight circuits. Now the headlight switch provides the ground circuit instead of power. So yes there is a relay between the main switch and the dimmer.
The headlights get power from left and right 15amp fuses, and the relay and main switch provides the ground circuit. Your owner's manual should tell you which relay in the box is for headlights.

Jan 19, 2014 | 2002 Chevrolet Impala

1 Answer

Headlights go off for a few seconds then back on


Have you replaced the headlights? If so you may have installed lights that have too much of a amperage draw and the circuit breaker is switching off. Actually it is not a circuit breaker as you know it, but a heat-sensitive breaker that opens the circuit when current (amperage) is excessive. A short in the wiring or even a headlight may also cause the same problem.

Mar 01, 2013 | Cars & Trucks

2 Answers

My durango headlight will not work on the right side


Well the turn signals are a different circuit.
Usually the common problem with one headlight is the ground circuit.
Both the high and low beam use the same ground. I would check for power for each circuit and a good ground at the light socket.

Dec 04, 2012 | 2002 Dodge Durango

1 Answer

2001 chevy impala overhead light wont turn off


see this steps and fix it use the VOM or DVOM. God bless you
The Cause: Most likely no voltage to the headlights because of a bad headlight relay, fuse, module, headlight switch, dimmer switch or wiring fault.
To figure out what's causing your problem, start by inspecting the main fuse for the headlight circuit. See your Owners Manual for the location of this fuse. It is often located in the power center in the engine compartment, but may also be in the fuse panel under the dash.
fuse1b.jpg If the fuse has blown, replace it with a new fuse (same amp rating) and try again. If the fuse blows immediately, there is a short in the headlight circuit that will have to be found and repaired before the headlights will work. If the fuse does not blow and the headlights work, problem solved (for now). There may be in intermittent short or overload that caused the fuse to fail.
If the fuse if okay, use a volt meter or 12-volt test light to check for power at the fuse. Most headlight circuits are on (powered) all the time, so there should be voltage to the power side of the fuse. No power at the fuse would indicate a wiring fault possibly in the fuse block or in the wiring between the fuse block and the battery. You'll need a wiring diagram to trace the wiring circuit and find the fault.
relay_1a.jpgIf the fuse is okay and there is power, the next check would be to find the headlight relay or control module. If the system uses a relay, pull it out and shake it. If anything inside rattles, replace the relay. Or buy another relay and plug that in to see if that restores power to the headlights.
On systems that use a module control module or daytime running lamps, about all you can do is eliminate other possibilities such as wiring faults, a bad relay or headlight switch first. If the module is getting power when the headlight switch is turned on, but the headlights fail to come on, the problem is likely a bad module. The module may be located in the front area of the engine compartment (common on Fords), under the dash or elsewhere in the front of the vehicle. You will probably need to refer to the vehicle service literature to find the module's location.
If the headlight relay or module do not receive voltage when the headlight switch is turned on, a bad switch is your problem. Switches get a lot of wear and tear, so it's not unusual for a switch to wear out after many years of service. Replacing a headlight switch can be difficult depending on whether is it located in the instrument panel or on the steering column.
If your headlights work on low beam, but you have no high beam, or they work on high beam but there is no low beam, the most likely cause is a bad dimmer switch. The dimmer switch is integrated into the steering column mounted headlight switch on most vehicles, so if the dimmer is not working, you will have to replace the entire switch.
DO NOT attempt to replace a steering column mounted headlight switch without first disconnecting the battery and waiting at least 20 minutes for the capacitors in the airbag circuit to discharge. The steering wheel will have to come off to replace the switch. Crossing up the wrong wires in the steering column could set off the air bag and cause personal injury.
If a headlight switch looks like it will be difficult to replace, don't try to do it yourself. Take your car to a dealer or repair shop and have them replace the switch for you.

Oct 16, 2012 | 2004 Chevrolet Impala

1 Answer

When I click the headlights to bright all of the lights go out. I have already replaced the switch in the stearing column. What is wrong.


Try disconnecting one of your headlights and click on the high beams. If it goes to high without any other problems, then the problem is in the other headlight high beam circuit. If all the lights go out, then the problem lies in the high beam circuit of the headlight you disconnected. You can verify this by reconnecting the first headlight and disconnecting the other one. There is most likely a short to ground in one of the high beam circuits.

If you have daytime running lights. That is, your headlights stay on automatically. You will need to check the daytime running light relays. There may be four of them to check. One of them grounds the high beams.

Jan 30, 2011 | 1992 Toyota Pickup

1 Answer

2000 Mercury G/Marq - After approx 45 mins of the car running, the headlights will start to flash. We've replaced the hlight switch and still does it. Any Suggestions ??


Yes, I suggest looking for the Headlight Relay and a Circuit Breaker. You should find the Relay in the Powerbox under the hood and the circuit breaker should be in the fuse panel.

What is happening is the contacts are overheating. Instead of blowing a fuse some models use a Circuit breaker which recycles when it cools down. You can get the same action out of a Relay that is going bad.

If this continues after you replace the parts you should test the voltage going to the headlights and check the bulb sockets for corrosion. The headlights are made so that the low beam and high beam are separate and they are not on at the same time. If both filaments were on at the same time it would overload the relays and the Circuit breaker.

You will see that the bulbs are rated with 2 numbers, like 45/65 for low and high beam. If one side shorts out it will pull an additional 65 watts. Instead of drawing 90 total on low and 130 on high for 2 headlights, it will pull 155 with 1 headlight shorted. Thats 25 watts more than the Relay or Circuit breaker is suppose to handle. After 45 minutes of this, you get the flashing.

Nov 12, 2010 | 2000 Mercury Grand Marquis

2 Answers

I have a 1998 cavilier i have no low beams,fuses checked good


 I’m inclined to believe you have a headlight switch problem and here’s why. There are 2 fuses one for each of the headlights on the vehicle. For the daytime running lights (DRL) to operate the fuse and wiring to the right head light has to be good, because it supplies the power for both headlights in the DRL mode. The fuse and wiring for the left headlight has to be good because the DRL relay needs power from that fuse to operate. The DRL relay in turn provides a path through the left headlight and wiring to ground. When you pull back on the dimmer switch, you are activating the flash to pass circuit of the headlight switch assembly. Because the flash to pass mode works you then know that the high beam wiring and headlight bulbs are in good condition. This also tells you that the ground circuit for the headlight switch is good. In many newer vehicles, the headlight switch doesn't provide power to the lights. The headlight switch has now become the path to ground to complete the circuit. The headlight switch and the high/low beam dimmer control are one assembly so when you replace one you get the other free. Such a deal! My coffee bet is on the headlight switch assembly.

May 12, 2009 | 1998 Chevrolet Cavalier

1 Answer

97 hyundai accent no headlights or heater fan


Under the dash fuse box ,fuse 15 (TCM ECT) is a combination of cluster, heater and headlights.probably a relay fuse!!!!! fuse 16is a relay fuse.

Mar 16, 2009 | 1997 Hyundai Accent

1 Answer

Dash lights, tail lights, brake lights, not working 1965 mustang


Probably either a bad ground (broken wire, rust) or a bad headlight switch. The brake light circuit goes from the stop switch (Located up above the brake pedal) through the headlight switch, through the light bulbs to ground. The tail light circuit goes through the headlight switch, through the bulbs and to ground. The only things that are in common are the headlight switch (Is this the switch you replaced?) and ground.
Not much, but hope this helps.
Have a super day!
Ron

Jan 09, 2009 | 1965 Ford Mustang

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