I put new alternator, brought new battery crank car battery gauge do not go any further than half and start dropping while driving and car shut down all power goes
My car has an automatic transmission.
You can verify alternator drive belt tension and measure charging system output at the battery posts. If the voltage output at the battery is with the required specification (roughly 13.8 to 14.4 volts but varies by model), check the condition of the battery. Batteries can be load tested to determine condition even if they are new. If despite normal charging system output, and a fully verified (100% charged) battery, you are still experiencing loss of electrical power, a circuit diagnostic will have to be performed to pinpoint the cause. If you desire that that diagnostic be performed by a certified mechanic, please use YourMechanic’s charging system/battery diagnostics service page and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
How to Identify and Fix Common car Problems ?
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It is possible that the problems that you have been experiencing with the bad alternators have damaged the battery causing it to be weak. This would make the Battery Light come on. It is also possible that there is a problem with the fusible link or the alternator fuse for the charging system.
One of the most common reasons the battery light comes on and the car battery stops charging is because of corrosion. Whether the corrosion is on the battery cables or cable terminals, it is still a problem that needs to be addressed. Another common culprit for the battery not charging is a problem with the alternator.
Contrary to its purpose, an alternator can drain a battery. It`s rare, but it`s possible. A draw on the battery only occurs if there`s a problem with either a component in the alternator itself or connections to it.
“If the [battery`s] voltage is low, replace with a new battery or charge the battery to the recommended 14.2 to 14.7 volts,” he says. “Then try to run the vehicle and see if the voltage after is outside of that range. If it is, that`s a sign of a bad alternator.”
The batteries connectors can jostle loose sometimes or terminals might corrode. This will either cause the engine to shut down completely or the battery won`t fully transmit power. To solve this problem tighten your connectors. However, corrosion related problems require you to clean the battery regularly.
The problem could still be a defective alternator or improper installation. A fuse could also be the cause. If you still have power (headlights still work) the problem is in the fuel or ignition system. Your vehicle has a very complex ignition system and should only be serviced by trained professionals.
The car battery light might come on for several reasons, but the most obvious reasons are: An old car battery. Car battery connections that are corroded. Car battery cables that are misconnected.
Charging problems can be caused by electrical faults in the alternator or voltage regulator, poor wiring connections at the battery or alternator, or a slipping or broken drive belt. Since most late-model import alternators are internally regulated, a failure of the regulator means the alternator must also be replaced.
Symptoms of a burnt out diode:
The engine will begin to run rough, lack power and eventually stall and not start again. The battery warning light will turn on, warning you that there is a problem with your alternator charging system. The headlights will become dim due to reduced battery voltage.
You have to stop shut it off and start again. 5 people think this is helpful.
A bad battery won`t damage the alternator, but a bad alternator can damage a battery. The car battery simply isn`t made to deliver electrical energy for extended periods, so both components need to be functioning optimally.
No, you can`t charge a car battery while idling. At best, it`ll charge the battery a few amps, but not nearly the hundreds of amps it took to start the engine. After a few days of starting and then idling the engine, you`ll steadily deplete the battery instead of charge it.
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.
If you`re unable to start your vehicle, check and see if the headlights and dash lights come on. If they shine bright and clear, that means that the battery and alternator are likely not the cause of the problem. If they were, there wouldn`t be enough power to run the lights.
Dead battery: A dead battery is the No. 1 cause of a no-start. If the battery is weak, but not totally dead, the starter may turn slowly.
A small amount of parasitic drain is normal and expected, since things like your clock and audio system need some power to avoid being reset every time you turn off the car. However, excessive parasitic drain can be a problem, leaving your battery empty by morning.
Alternator Low Voltage Between 10-20% of rated output
This indicates lack of excitation, which could be: The Automatic Voltage Regulator (AVR) fuse (if fitted) has blown. The Automatic Voltage Regulator (AVR) has failed. A break in the excitation circuit between the AVR and the exciter stator.
One of the most common problems you`re likely to experience with an alternator is a failure in the bearings. There are needle bearings in the alternator that allow the rotor to freely spin inside the housing, and those bearings can break down over time as a result of exposure to heat and dirt.
Diodes are responsible for converting alternating current (AC—what the alternator produces), into direct current (DC— which is what the vehicles battery and other electrical components run on). If the diodes do not function properly, the alternator will not work.
Probably, the most common symptom associated with a bad regulator is flickering, dimming, or pulsing lights. To be more specific, you may notice that the vehicle`s: Headlights fluctuate between bright and dim, without you doing anything. High beam isn`t working as expected.
You can never have too much amperage when it comes to alternators; therefore, you never have to worry about choosing an alternator with too high of a rated output. Here`s why: Amperage is basically the amount of electrical current your alternator can supply.
Disconnecting your battery and draining the power to cause an ECU reset is one of the most common fixes for a check engine light that won`t go away on its own. Doing so is equivalent to a hard reboot on a desktop computer, which is a standard way to eliminate many common problems.
After replacing your alternator, your vehicle may not start for various reasons. Car owners need to check the battery after replacing an alternator. It is important to check the battery regularly. It will kill the alternator again if the battery isn`t fully charged.