- Can a battery read good but still be bad?
- Can a bad cell in a battery cause the alternator to fail?
- How do I know if my alternator needs replacing?
- How do I know if my battery is bad or my alternator?
- Can jumping a car ruin your alternator?
- Does an alternator smell when going bad?
- Why won’t my car start but the radio and lights work?
- When I try to turn on my car it just clicks?
- What would cause a alternator to keep going bad?
- What are signs of a bad alternator?
- What is acceptable ripple voltage?
- Why won’t my car start but I have power?
- How long will battery last if alternator is bad?
- What are the symptoms of a bad voltage regulator?
- What is acceptable alternator ripple?
- How long should you jump a car for?
Can a battery read good but still be bad?
Batteries with open cells may read fully charged in idle, but they fail under a load test.
These 3 steps will help you determine if your battery is bad or not….Here are some ways to test your battery, and determine if it’s bad.State of ChargeVoltage50%12.225%12.0Discharged0 – 11.92 more rows•Jun 5, 2012.
Can a bad cell in a battery cause the alternator to fail?
Yes. A defective battery can damage a perfectly good alternator. The alternators function is to recharge the battery once it’s been used to start the engine. And to keep the battery charged when various electrical systems are used in the vehicle.
How do I know if my alternator needs replacing?
Signs of a Bad Alternator Some of the things to look for are no-starting and trouble starting, dimming lights and problems with stereo system output. If your car starts but stalls when you’re underway, your battery is probably not being recharged due to a faulty alternator.
How do I know if my battery is bad or my alternator?
An illuminated dashboard light can indicate a problem with an automobile charging system. However, a very simple way to check if the alternator is working is to run the car and disconnect the positive terminal of the battery. If the vehicle stops running, then you probably have a bad alternator.
Can jumping a car ruin your alternator?
Any battery or alternator issues that affect power quality will be transmitted to your car. The good news is that large 12v batteries make excellent buffers against power issues that might otherwise cause damage. However, it is still possible to suffer damage to your car from jumping someone elses.
Does an alternator smell when going bad?
An overworked alternator might smell kind of like that. … A pulley that isn’t in alignment or not turning freely will cause more friction on the belt, which creates heat and then the smell of burning rubber. If those get too hot, your nose will probably know. Not all bad smells indicate potential alternator trouble.
Why won’t my car start but the radio and lights work?
The most common causes of no-start conditions are the battery, starter, battery cable, ignition switch, or the fuel pump. Any of these can be intermittent issues, which will not always act up. Given that you have had success with shaking the battery cables, this may indicate that one of the cables is failing.
When I try to turn on my car it just clicks?
A rapid clicking noise when trying to start your car could mean there’s something wrong within the electrical system. Perhaps your battery’s dead, or your alternator, which charges the battery, isn’t working correctly. … You may need to replace your alternator or battery.
What would cause a alternator to keep going bad?
Bad diodes are a common cause of alternator failure. … If only one or two diodes have failed, the alternator may still produce enough current to meet the vehicle’s electrical needs, but it may not be enough to keep up with higher loads or keep the battery fully charged. This could cause the battery to run down over time.
What are signs of a bad alternator?
6 Symptoms of a Failing AlternatorThe indicator light. … Headlights are dim or flickering. … Other electrical failures. … Strange noises. … Car stalls or has difficulty starting. … Battery dies.
What is acceptable ripple voltage?
Acceptable ripple voltage is about 100mV peak to peak. Majority of good power supplies have ripple and noise figures of better than 10mV rms, while SMPS figures of 50mV or less are possible, however, higher current supplies are likely to have slightly higher values.
Why won’t my car start but I have power?
If you turn the key and can hear the starter motor trying to turn the engine over, the lack of power is likely caused by electrical issues such as a weak battery, dirty battery terminals or a worn starter motor. … Corrosion over time can interrupt the flow of electricity from the battery to the rest of the car.
How long will battery last if alternator is bad?
about 30 minutes to 1 hourA 12 volt battery in most cars will run about 30 minutes to 1 hour without lights or air conditioner, since many components will run than old cars before. Starting a car takes a lot of power. You should buy a battery with more power or fix your alternator.
What are the symptoms of a bad voltage regulator?
Symptoms of a Bad or Failing Instrument Voltage RegulatorDim or flickering gauges. One of the first symptoms of an issue with the voltage regulator is dim or flickering gauges. … Inaccurate or erratic readings. Another symptom of an issue with the voltage regulator is inaccurate or erratic readings from the voltage regulator. … Inoperable instrument cluster.
What is acceptable alternator ripple?
A multimeter can read AC voltage and can be used to test for ripple. The alternator should be replaced if AC voltage of more than 50mV is detected (in some cars as much as 100mV is acceptable). … If there is more than 0.1 volt (50-100mV, depending on the vehicle) of AC ripple, then the alternator is most likely bad.
How long should you jump a car for?
If the engine still won’t start, allow the good car to run for 5-10 minutes while hooked up to the dead car. Rev the engine slightly. This may build a charge in the dead battery and allow you to restart. If these steps do not work after three or four more tries, stop trying to jump-start.