What’s wrong when the alternator is not charging the battery, both parts are new, car Will go dead after driving 20 mins
Car have new starter, battery, and alternator, the car cut off after 20 mins,it's no power going from the alternator to the battery, what can that be
My car has 179000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Your vehicle has a fusible link in the wire harness that goes from the main wire on the alternator to the starter. If you had the starter replaced then maybe the wire was not put on the starter.
The fusible link acts like a fuse, but also looks like a wire in the harness. Check if this wire is connected to the starter and that it’s not burnt in two. Sometimes the fusible link wire will burn in two but the wire outside cover stays intact. You have to pull on the wire to tell if it is burnt. I’d recommend having a mechanic diagnose your vehicle in order to fix your batter/alternator issue accurately.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
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.
Faulty Alternator
The car`s alternator charges the battery when the engine is running. If you have a bad alternator, your car battery doesn`t get charged properly. While the alternator can last much longer than a lead-acid battery, it still has a limited lifespan.
If the alternator`s fuse or fusible link is blown, the alternator will not be able to charge the battery. The battery then doesn`t store enough power for starting the car or keeping it running.
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.
“Electrical devices or lights left running, a defective charging system or alternator, and extreme weather are some common reasons but maybe it`s just time to get a new battery.”
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.
While the size of your fuse depends on the amperage of your alternator, you should generally select a fuse that can handle more amperage than your alternator is able to output. For example, if your alternator outputs 200 amps, you should choose a fuse that`s no less than 200 amps.
An effective method to determine whether it`s your battery or alternator that`s gone bad is to connect jumper cables from a running vehicle`s battery to yours. After a few moments, try starting your vehicle. Once it`s started, remove the jumper cables — if your engine stalls, your alternator has probably gone bad.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
What’s wrong when the alternator is not charging the battery, both parts are new, car Will go dead after driving 20 mins
ANSWER : Your vehicle has a fusible link in the wire harness that goes from the main wire on the alternator to the starter. If you had the starter replaced then maybe the wire was not put on the starter.
The fusible link acts like a fuse, but also looks like a wire in the harness. Check if this wire is connected to the starter and that it’s not burnt in two. Sometimes the fusible link wire will burn in two but the wire outside cover stays intact. You have to pull on the wire to tell if it is burnt. I’d recommend having a mechanic diagnose your vehicle in order to fix your batter/alternator issue accurately.
Just put a new carburetor, battery, starter relay, alternator, car stalls out while driving and battery dies when restarted
ANSWER : The battery should be load tested. Simply charging the battery or measuring voltage is not adequate. Measure charging output, too. You want to confirm that the ignition system, including for instance the ignition coil and ignition switch, are not intermittently cutting out. Coils can fail as temperature rises (resistance increases with temperature) so if you run the car for a while and all of a sudden it quits, measure the resistance of the coil windings to see if that provides a clue. Apart from that, the ENTIRE primary side ignition circuit has to be checked, using voltage drop testing (and testing of the hall effect sensor in the distributor), to rule the primary side in or out. If you want the required diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a stalling diagnostic 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.
Replaced alternator on car 2 times each time shows it’s charging 14v let car run for a little bit then test drive and car voltage
ANSWER : There are reports that the replacement alternators will not communicate with the engine computer and will not charge correctly. I recommend using only the manufacturer approved replacement part. It can be new or remanufactured but approved for use in the vehicle. Some lower cost alternators on the aftermarket will have charging problems since they will not communicate with the ECM on the vehicle and will stop charging.
I put new alternator, brought new battery crank car battery gauge do not go any further than half and start dropping while driving
ANSWER : 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.
My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
We have a new battery, new alternator, new coil pk, new master fuse and the car still won’t hold power.
ANSWER : Hi there. The only thing that I could think possible is causing your problem is that something may not have been correctly installed while your son was completing this maintenance. However, if your engine was difficult to start before this service, it’s possible there are different components that are damaged that simply didn’t resolve the issue. The only way of knowing what is going on with your Trailblazer would be to have one of our mobile mechanics in your area come to your location and complete a car is hard to start inspection.
installed new alternator and battery the alternator is charging the battery and the battery is maintaining afull charge but the ba
ANSWER : Hello. If the battery and the alternator are new and if it is verified that the alternator is charging then you have an issue with programming. When you replace the battery on this vehicle the computer needs to be reprogrammed to recognize it and to properly charge it. If this is not done then the computer will not turn on the alternator at the correct times an this battery light will come on. You need to have this programming done by a certified mechanic, like one from YourMechanic, who can come to you to [program the battery into the computer] https://www.yourmechanic.com/services/battery-light-is-on-inspection
Why won’t my 2004 Audi A6 Quattro charge brand new battery??
ANSWER : Hello. Most of the time the issue is in the wire coming from the battery to the alternator. This small wire has a tendency to fail and have high resistance. This needs to be checked first. If that is not the cause then you may have a computer issue. I would need to check that with a scan tool that will communicate with the vehicles main computer. If you are looking to have this done, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the vehicle is not charging] https://www.yourmechanic.com/services/battery-will-not-hold-a-charge-inspection
