Possible electrical issue

98 pontiac grand prix gt. 3.8 v6 the tail lights are not working however the break lights work fine, I have replaced the fuses and the bulbs, so I assume it has to be a issue in the wiring, I am trying to figure out witch whirring harnesses could be affecting this issue, I have a parts car and need to pull all the possible parts that could solve the issue this week, if you could reply with possible harnesses to replace along with any other possible diagnosis I would appreciate it, my email a dress is [email protected]

My car has 180000 miles.
My car has an automatic transm

Experienced mechanics share their insights in answering this question :
Hello. Most of the time this is not a harness problem. It is typically caused by an issue with the combination switch. This switch typically shorts internally and causes this. I have also had fuse box issues that have caused this but that is not as likely. The only way to know for sure would to test the circuit with a voltage meter to see where the voltage is lost, which is typically at the switch. If you need help with fixing this taillight issue, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose why the lights are not working.

How to Identify and Fix Common car Problems ?

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

The most common reasons a Pontiac Grand Prix won`t start are a dead battery, an alternator problem, or failed starter.
The most common reasons a Pontiac Grand Prix heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
The most common reasons a Pontiac Grand Prix radiator fan isn`t working are the fan assembly, the fan clutch, or the coolant temperature sensor. Search our network of RepairPal Certified shops near you to speak with a technician about your issue.
It is located under driver dash,left of steering column.
If the car cranks when you turn the key, but the engine won`t start, it could be because fuel isn`t getting to the engine. One potential reason for this could be dirty fuel injectors. Over time, the fuel injector nozzles can become clogged with rust, corrosion or debris.
If your vehicle won`t start, it`s usually caused by a dying or dead battery, loose or corroded connection cables, a bad alternator or an issue with the starter. It can be hard to determine if you`re dealing with a battery or an alternator problem.
A faulty or broken thermostat is the most common cause of your car`s failing heat. Stuck open or stuck closed, the part can not only cause issues with your heat but also with your engine`s cooling system.
One of the most common issues with a heating system not functioning is dirty air filters. If your air filters are extremely dirty, then the airflow can be blocked. Check for clean air filters, vents, and registers. Make sure there are no rugs or furniture blocking vents or registers as well.
An unlikely, but possible, cause is a bad thermostat. Try turning the Fan switch to the “On” position to see if the blower comes on.
When you turn the furnace on but no heat comes out, there may be an obstruction. Dirty air filters restrict airflow, which can make it feel like not much heated air is coming out of your vents. Check the furnace filter and replace it if its surface is covered with contaminants.
Troubleshooting Tips For Furnaces Not Blowing Hot Air

Make sure your thermostat has not been set to a lower setting by someone else. Check your thermostat`s batteries and replace any that are exhausted or defective. Clean all of the parts of your furnace, especially the ones that are susceptible to dust and dirt.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Possible electrical issue
ANSWER : Hello. Most of the time this is not a harness problem. It is typically caused by an issue with the combination switch. This switch typically shorts internally and causes this. I have also had fuse box issues that have caused this but that is not as likely. The only way to know for sure would to test the circuit with a voltage meter to see where the voltage is lost, which is typically at the switch. If you need help with fixing this taillight issue, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose why the lights are not working.

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The engine will not turn over, and the issue seems to be electrical.
ANSWER : Hello. From what you describe it sounds like one of your vehicle’s relays may have failed. If the vehicle is no longer starting it may be possible that one of the relays associated with the starting system has gone out and needs to be replaced. Relays are electrical components that act as switches for the electrical system. They are often times located in the vehicle’s fuse panels, and beneath the dash. It is not uncommon for relays to burn out or shirt circuit and require replacement. If the smell and noises appear to be coming from underneath the dash I would check for possibly faulty relays their first. Similar symptoms can also be caused by faulty wiring or connectors. I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose the no start condition and electrical issues.

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Cooling fan unresponsive and other electrical issues – 1995 Dodge Spirit
ANSWER : Hello. It sounds like you have an issue with a bad electrical connection. Most of the time, this occurs from either a bad connection at the battery or a bad negative battery connection. The negative connections at the body and frame come loose or become corroded and cause this. It will take some testing with a voltage meter to find the issue. If you want to have this done, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the electrical conditions and have this problem repaired.

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Blinking Check Engine Light, issues with rpm, possible spark plug issue?
ANSWER : Hey there. The gas smell you experience is most likely due to the unburned fuel due to the engine misfiring. Since you smell unburned fuel, the cause is most likely spark-related. If any spark plug is not firing correctly, the spark plugs themselves can be at fault or they can be the effect.

If an ignition coil is not firing the spark plug, then the bad coil is the cause and the misfiring plug is the effect. Also, the ignition coil may not be firing properly due to the coil itself being shorted or possible receiving a poor signal from the engine control unit.

You should have a certified technician look into the Check Engine Light as soon as possible. Continued driving with the light flashing can cause internal engine damage if not corrected.

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What is wrong with my car?
ANSWER : If the vehicle is not starting, simply request a no start diagnostic and the responding certified mechanic will get the underlying fault identified and resolved. Basically, the first thing to do is load test the battery. Although I understand your suspicion that the immobilizer may be preventing the car from starting, until an actual diagnostic is performed that is a speculative cause. If the immobilizer system is on, you may see a security warning light. If you see such a light, to temporarily override the immobilizer system, see these instructions. If you do not see a warning light, again I would not assume that the immobilizer is the problem because there are lots of other potential causes for the no start you are describing.

With a fully charged battery and the immobilizer system off, if the starter motor does not operate, either there is no power to the starter motor, hence the starter circuit would have to be diagnosed, or the starter itself is bad and it would be replaced. If there is no starter motor operation at all, that is if there is no starter operation with the key held in the "start" position, the procedure is to test for power and voltage drops to the starter motor/solenoid. If there is no power or a large voltage drop is measured, then the electrical circuit supplying the motor has a fault. That circuit begins at the battery and includes grounds, wiring (some of which is very heavy cabling), fuses, relays, the ignition switch, neutral start switch, and terminations. Basically, with a fully charged battery, and with the key held in the "start" position, the starter is either getting power or it isn’t. With the key in the "start" position, if the starter motor is getting power but the starter doesn’t work, then the starter is condemned and replaced. Note that starters can and sometimes do develop intermittent faults due to bad spots on the armature. The bottom line is if there is battery voltage to the starter (and no excessive voltage drop) and yet the starter doesn’t work, it’s dead. If you desire that a certified mechanic resolve this, please request a no start diagnostic and the responding certified mechanic will get the problem diagnosed and repaired for you. Please let us know if you have further concerns or questions as we are always here to help you.

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Good evening , I want to see if it’s possible to swap the engine to a small block Chevrolet. What are the main issues?
ANSWER : Hi there. You can swap the engine in your vehicle, but you will need to swap the electrical system for the engine to run properly. If you plan on using a newer model with the computer system for OBD2, then the computer and all of the electronics including the fuel system needs to be swapped over. The exhaust system will need to be swapped over as well. Plus, either you can get an adapter plate and a spacer for the clutch and adapt the Toyota transmission to the Chevrolet engine, or you will have to install the engine with a GM transmission. If you need to change the transmission, you will need to modify the driveshaft to fit the transmission, have the right length to the differential, and fit the differential. You also will need to modify the engine mounts to fit the engine and transmission. If you need further assistance with your engine swap, then seek out a professional, such as one from Your Mechanic, to help you.

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Car jerks when accelerating in reverse & makes grinding noise. Is this a transmission or computer issue?
ANSWER : Hi there. Typically when you hear a grinding noise when you move forward or in reverse it’s usually an indication of a gear fault either in the transmission or another driveline component. If this occurs only when in reverse, it’s likely a damaged reverse gear. It is also possible that it’s a hydraulic fluid issue not supplying enough lubrication or pressure inside the lines to fully open the gear. I would recommend having a professional mechanic come to your location and complete a car is hard to shift inspection, so they can diagnose the source of your issue and recommend repairs that should resolve this problem.

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I believe I have an electrical issue. When I turn key the starter doesn’t always spark and it takes a few tries but others it turn
ANSWER : The door lights and radio are on different circuits than the starting system and so faults there would not cause difficulty starting. The flickering of the lights is due to a loose connection somewhere in the circuit and can be diagnosed if you request an electrical component diagnostic. Starters can develop faults in the motor armature leading to intermittent operation (sometimes if you hit the starter with a rubber mallet and then try to start the engine it will work as the armature moves off of the bad spot). If there is no starter operation with the key held in the "start" position, the procedure is to test for power to the starter motor. If there is power (and no voltage drop), but no starter operation, then the starter motor/solenoid assembly is faulty. If there is no power, then the electrical circuit supplying the motor has a fault. That circuit begins at the battery and includes grounds, wiring (some of which is very heavy cabling), fuses, relays, the ignition switch and terminations. Basically, with the key held in the "start" position, the starter is either getting power or it isn’t. With the key in the "start" position, if the starter motor is getting power but it doesn’t work, the starter is condemned and replaced. On the other hand, with the key in the "start" position, if there is no power to the starter, then the circuit is traced until the fault in the circuit is found. In addition to a faulty ignition switch, faults can include high resistances, due to corrosion, wire strand breaks, or loose terminals, which can only be diagnosed using a voltage drop test. If you desire that a certified mechanic resolve this, please simply request a no start diagnostic and the responding certified mechanic will get the problem diagnosed and repaired for you. Please let us know if you have further concerns or questions as we are always here to help you.

Read Full Q/A … : Possible electrical issue