Lowbeams on drivers side will not shut off

resently bought a 2006 mercury montego was told it needed a hid ballast replaced on the drivers side. Have replaced it 2 times and still having the same issue, low beams will not shut off only on drivers side, if I hook up passangerside assembly to drivers side, everything works fine , hook up the drivers side assembly , low beam will not shut off?????????

My car has 130000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hey there. To be completely honest my friend, you might need to go back to the basics and purchase a detailed wiring schematic for this vehicle to determine where the electrical fault exists. Quite often when an electrical fault like this exists, the best solution is to trace every connection to see where the fault is triggered. Most of the time, it’s an exposed wire or ground issue that causes the circuit from the switch to the lights to fail. If you need help here, one of our professional mechanics can come to your location and complete an electrical problems inspection.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. About the only cause that is an easy fix is a blown fuse. Consult your owner`s manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.
There is a good chance that your ballast is the cause of your lighting problems if your headlights are dim, changing colors, buzzing, or flicker. When inspecting it for potential issues, any burn marks, leaking oils, or swollen casing are indicators of failure.
A bad headlight relay is among the more common reasons we see for low beam headlights not working while the high beams do. You see, the low and high beams each have their own relay, which is essentially an electrical switch. Like fuses, sometimes relays go bad.
Bad Relays

If a bad headlight relay is a reason your headlights won`t turn off, the fix is to replace the relay. This is a little easier to check since there`s a chance that multiple circuits may use the exact same type of relay.

It will most likely be under the hood of your vehicle where your main fuse panel is located. However, it may be located inside the cab of the vehicle if you vehicle is equipped with an interior fuse box.
Check the Ballast with a Multimeter

Insert one probe into the wire connector while holding the white wires together. Touch the other probe to the ends of yellow, red, and blue wires coming from the ballast. Some might exclude the yellow. If the ballast doesn`t cause the needle to move, you know it needs to be replaced.

Stand under the light or a place close to the light and point your cell phone camera at the light. If you can see some strong dark strips flickering in your camera, it must be a magnetic ballast based light. Otherwise it should be an electronic ballast based light.
Locate the plastic tabs that hold the lens to the backing around the edges of your headlight. Lift each tab up with your fingers to separate the 2 pieces of your headlight. If you have trouble peeling them apart by hand, position a pry bar or flathead screwdriver under the tab and pry it up.
All the electrical systems in your car, including the headlights, are protected with fuses. These are designed to `blow` and break the circuit if too much power comes through them.
Faulty switch: The switch itself may be faulty and not able to properly turn off the circuit that controls the lights. Wiring issue: There could be an issue with the wiring, such as a short circuit or a loose connection, that is allowing electricity to flow to the lights even when the switch is off.
Lasting Light. If the car interior light simply won`t turn off, then check the switch. It may have gotten bumped accidentally by a passenger, valet or car wash employee. If the switch is in the “door” or “off” position and your interior light still stays on, then you should consult a mechanic.
Depending on how your headlight circuit is set up, there may be one fuse or multiple fuses for the headlights. If you find a blown fuse, then replacing it may fix the problem. When replacing a blown headlight fuse, it`s important to use a new one with the same amperage rating.
Causes of Ballast Failure

When it`s too hot or too cold, the ballast can burn or fail to start your lamps at all. Heat combined with prolonged condensation inside an electronic ballast can cause corrosion. Some people may suggest removing the parts of the ballast casing and cleaning the electrical board.

Without a ballast, a lamp or a bulb will rapidly increase its current draw and it can become uncontrollable as well. When a ballast is present in a lamp, the power becomes stable, and even if such lamps are connected to high power sources, the ballast will regulate the energy and avoid the current rise.
According to the Certified Ballast Manufacturers Association, the average magnetic ballast lasts about 75,000 hours, or 12 to 15 years with normal use. The optimum economic life of a fluorescent lighting system with magnetic ballasts is usually about 15 years.
Do LED Lights Need Ballasts? An LED light does not require a ballast because it uses a component called a “driver” to regulate the power going into the bulb.
Lamps will have a part number and specification on them that will help you determine the name (CF for “Compact Fluorescent” or F for “Fluorescent”), shape (T8, T12, etc.), and wattage. For example, an F32T8 is a 32 watt Fluorescent Tubular Lamp. Every ballast will tell you how many of a certain type of lamp it can run.
Always disconnect the battery when changing a blown headlight bulb. Headlight bulbs are connected to your vehicle`s electrical system. They`ll pull power from the battery while the alternator recharges the battery.
About headlight switches:

In most cases, the headlight switch will control several other functions. Depending on your car, the headlight switch could control the headlights, high beam lights, low beam lights, park lights, indicators / turn signals and fog lights.

As you stand in the front of the car, have the assistant turn the headlights off. Next, put the dark cloth or cardboard over one headlight, and have the assistant turn the headlights on. Find the adjusting screw and turn the screws slowly clockwise to raise the height of the lights or counterclockwise to lower them.
Unlike high beam headlights, these point down at an angle to better illuminate the road. That`s why low beams are referred to as “dipped beam” headlights in some parts of the world.
Hidden headlamps, also commonly known as pop-up headlamps, pop-up headlights, flip-eye headlamps, or hideaway headlights, are a form of automotive lighting and an automotive styling feature that conceals an automobile`s headlamps when they are not in use.
Where is the Headlight relay located? You can find the Headlight relay in the electrical distribution unit of the engine block. In case you need support locating the relay, refer to your owner`s manual.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Lowbeams on drivers side will not shut off
ANSWER : Hey there. To be completely honest my friend, you might need to go back to the basics and purchase a detailed wiring schematic for this vehicle to determine where the electrical fault exists. Quite often when an electrical fault like this exists, the best solution is to trace every connection to see where the fault is triggered. Most of the time, it’s an exposed wire or ground issue that causes the circuit from the switch to the lights to fail. If you need help here, one of our professional mechanics can come to your location and complete an electrical problems inspection.

Driver side door lock button not working, and passenger side sliding door makes a buzzing noise
ANSWER : Hi there. These door issues are common on this vehicle. Most of the time the main issue is the master door lock switch on the driver door. It sounds like you already replaced that. As for the sliding door problem, most of the time, this is a failure within the door module or it can be a connection issue.

I typically take the door apart and check the connections on the module and inside of the door just to make sure that there is nothing apparent in there. If the connections and the wiring are fine, then I use a scan tool to check the module to see what the inputs and outputs are doing. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your door problem and recommend a repair.

Driver Side Inner & Outer Tie Rods and driver side strut being bent.
ANSWER : From what you’ve described, the damage was most likely caused from hitting a pot hole. If the damage was from a pot hole on the right side, in some cases it’s possible for the force to transfer over and damage the left side as well. If you’d like a second opinion on this, consider YourMechanic, as a certified technician can come to your home to diagnose your car’s suspension system and confirm these suspicions.

Power mirror on passenger side will not retain it’s setting driver side works perfect.
ANSWER : A technician with an advanced scan tool can verify the issue. The mirror system is complex and involves many modules. The Body Control Module is a possible cause, but it’s doubtful; replacement requires reprogramming, which requires special equipment. I would check the driver’s and passenger’s door modules; toggle or move the switch on the driver’s side to see if it causes the problem, and ensure that the mirror glass itself is not loose on the passenger’s side mirror assembly.

Without diagnosing the problem with advanced equipment, the issue is hard to diagnose. A qualified YourMechanic technician can show up to the location of your vehicle with a scan tool to inspect and diagnose your power mirror issue.

Front driver side tire moves side to side when jacked up
ANSWER : If you can move the tire in and out when on a jack then you may have a few different possible problems. The inner or outer tie rod ends may be worn. Your steering gear may also have worn bushings. I would recommend moving tire back and forth while holding onto the tie rod ends to see if looseness is felt and replace any loose components. An alignment will need to be done after repairs.

Having problems with door locks on 08 Cadillac CTS. Driver side door especially and will not lock or unlock with key. Others loc
ANSWER : This is often related to a malfunctioning door lock actuator, a blown fuse or a faulty power door lock switch. When you use the door lock switch in the car it sends a signal to a relay which then activates an actuator inside the door. The actuator is the final step in the process in that it is a small motor with a set of gears that actually locks and unlocks the latch mechanism inside the door allowing the door to open. When this motor is bad, the latch mechanism will fail to operate and cause the door not to unlock as it is designed to. In the case of a bad door lock relay, the power, normally needed to send the signal from the switch when you activate it to the actuator motor is not there. This means the relay is not allowing the circuit to be completed and the actuator motor is not activated. Any of the above may cause your power door lock switches not to work properly and should be diagnosed by a qualified mechanic. I would suggest having a professional from YourMechanic come to your location to take a look at the door locks in your vehicle.

Is there grease in the left side front driver side wheel bearing
ANSWER : The wheel bearings on the front of your car are within unitized hub assemblies and thus the grease that is placed within when the hub is manufactured is permanently sealed inside. It will not leak out. If the bearing has failed that is typically due to overtightening of the axle nut when the vehicle is re-assembled during the repair. The nut that holds the CV axle to the hub can ONLY be tightened with a calibrated torque wrench and the nut has to be tightened only to exact value published in the Factory Service Manual. Shops and amateurs will sometimes use an air tool or an ordinary wrench, contrary to the explicit instructions, and the consequence is the axle nut is overtightened and the bearing is guaranteed to fail prematurely. The other common cause of premature bearing failure is the use of cheap aftermarket bearings (or hub assemblies). If you use the OEM (dealer supplied) bearing or a recognizable, reputable vendor such as SKF you will be better off. The grease you are seeing is from another source and that is likely to be the CV outer joint. You can check to see if the outer CV boot is torn or damaged. If so, the grease has come out and CV joint failure is not far off. To get the bearing inspected, and replaced if failed, please request hub assembly inspection/replacement. To obtain service on the CV joint, please request CV joint inspection/axle replacement. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

My heater is blowing air through the driver side air vents but is blowing cold air through the passenger side and rear console ven
ANSWER : Hi there:

Climate controlled vehicles have multiple electrical relays that open and close vents to maintain the desired temperature. In some instances, these relays can wear out overtime. However, it’s also common for debris to clog up vents (especially side vents) which may restrict the flow of cool air. The best way to determine why your AC is not working efficiently, it might be best to have a professional mechanic complete a AC inspection; so they can pinpoint the source of your issues and recommend the right repairs.