After fully charging the battery, when running the car battery light comes on. Then, in several miles other assorted lights come on ( as the lights grow dimmer and dimmer) - finally ending up with nothing. After fully charging the batter again, same sequence. Help! Alternator!
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Used your battery up just getting home. Now recharge the battery, and test the charging system- could be a bad alternator not charging the battery.
Normally, the alternator powers all the car's electrical needs when the engine is running. If the alternator fails, the battery will then be used to run the electrical needs until the battery is depleted, then the car will shut down. Dead, just like yours. No big deal, just find out why the charging system stopped.
if you have a fully charge the battery and you have had the battery load tested to ensure that it is a good battery then a fully charged battery will run an engine for several hours providing that there are no other power draws on the system. That means -no big radio ( amplifiers ,cds, blue tooth)draws -no lights -transmitters --cigarette lighters ---power window usage Especially no repeated starting of the engine
Normal for a 3 year old battery. it has internal resistance that discharges it self.
Disconnecting the battery will not help.
A way to see if vehicle is causing the discharge,but it will dump the radio and clock settings....take off one of the battery terminals and put a test light (12 V.) between the terminal on the battery and the cable end. If the test light comes on,there is something ON in the car.
If the computer memory is dumped due to low voltage,the car has to "re learn" all of it's setting and will usually not idle well at all!
Please have the battery load tested after it has been fully charged.
Dead cell in the battery would prevent it from charging fully
Bad or worn drive belt would slip, preventing the alternator from fully charging the battery
If the car will run at idle with all accessories turned on, the alternator is good and you should concentrate on the battery and battery cables. If the car won't idle, then the drive belt and/or alternator could be the issue. If the car starts everytime when it's cold and only gives you a problem starting when the engine is hot, the starter could be the issue. A bad starter will often work when it's cold (after sitting a few hours or overnight). When a bad starter gets hot, it takes more and more power to get it to turn over. Overall, I'd have the electrical system checked out. Most chain auto parts stores (Autozone, Advance Auto) will do a complimentary electrical test for you.
Replace the battery. The batter is on it's last leg and is about to die. The reason the light went off is because as you drive, the alternator provides charge to the battery. So the further you go, the more charged the battery becomes. That said, if the Battery warning light was on when you started the car, and you had not left any interior lights on over night, then the battery is losing charge rapidly or is not holding a charge.
This is indication of the battery being in good shape and almost fully charged. The light on the dashboard is an indication that your dynamo is producing sufficient current, which increases when you rev up and the vehicle is no longer drawing any charge from the battery. On idling, dynamo produces less current, thus to keep the electrical parts running it draws a small amount of charge from the battery thus lighting the indicator is very dim. Do not worry. Everything is OK with your cars engine & battery...........sodeep
The alternator is not charging the battery. Could be alternator, voltage regulator (which is usually in the alternator) , dirty/loose connections. First I would inspect all relevant electrical connections, clean & tighten. If no change -- replace alternator.
But be sure to fully charge the battery before you run the new alternator (follow alternator installation instructions).
The battery charger circuit has failed. If it has a fuse, see if its OK. This input comes from the dynamo, but if your headlights work, then the dynamo is OK. If you are not familiar with the electrical system like checking the leads with a multimeter then best to have a technician(vehicle electrical technician) to check it and if the fuse is OK then the rectifier may require replacement................sodeep
They can check the battery and the charging system for starters. Fully charged battery,clean cables. then do a load test on the battery. If it didn't pass the test replace it and check the charging system.
Charging system easy to check , Put voltmeter on battery terminals and monitor vehicle's voltage with and wthout accessories on. should be between 13.5 to 14.5v . Before condemning alternator inspect wiring behind alternator ...if corroded replace then retest.
If voltage is with range then the problem is in the power distribution compartment/ relay, or either is a ground all those items share.