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From your description it sounds as if the warning light is operating correctly. When the engine is running the battery is being charged and the electrical needs of the vehicle are being fully met by the alternator's output and the battery is not expending stored power. When you turn the engine off the alternator stops running and anything in the vehicle that requires electircal power is suddenly dependent upon the battery to supply it. Thus, the battery begins discharging power, which triggers the warning light indicating that the battery is being discharged.
What else can I help you with?
Why is your 1988 Chevrolet truck with a 305 engine running of the battery only and not the alternator?
If it is running on the battery only then that means the alternator is not charging the battery.
1999 Ford Expedition battery light on?
The battery light indicates the system is not charging. Have the charging system checked. If the alternator is not charging, the engine will quit running and leave you stranded.
Why 1988 Dodge truck stopped running has new battery?
bad alternator ? its not charging the battery
On a 1988 Lincoln town car limo why does the lights flicker when engine is running?
It is possibley your alternator or battery
Does a car have to be moving to charge the battery?
No , for the battery to be charged the engine must be running . This means that your alternator , if it's functioning properly , is charging the car's battery as the engine is on/running .
Could a bad coil keep the alternator from charging the battery?
Yes, because a bad coil will not allow the engine to run. But if the engine is running then the coil has nothing to do with the alternator charging the battery.
Can you charge a dead battery by getting a second car that is running take the good battery out of the running car and put the dead battery into the running car as a means of charging it?
No, this will place a very heavy load on the alternator of the car and may result in burning out the diodes of the car charging the battery. You could easily ruin the alternator. Purchase a battery charger and charge the dead battery with that. Alternators are not made to charge dead batteries.
Can you use and charge and battery at the same time?
I kinda wonder that myself...I am running my 12v LED computer fan from a 12v battery pack from my Ryobi drill with the charging cable inserted into the battery...it says its charging, and my fan is running...So, I will see if it doesnt explode...fingers crossed...
Should your car turn off while is running if it has a bad battery?
If the cause of the dead battery is from the charging system failure, yes.
What will a new battery do for a truck?
As long as the alternator works and your charging system is correct, the new battery will start your truck and keep it running.
Why is the car battery charging at 14 volts running and 13.5 not running?
your alternator charges the battery while the car is running. The alternator actually puts out a higher voltage than 14 volts while it is running, but it is reduced by a voltage regulator (most of which are already built into the alternator housing), to prevent damage and premature death of the vehicles battery. While your car is not running, the alternator is not charging the battery, and the 13.5 volt reading you get is just the measurement of the voltage the battery is holding at that given point.
How do you know if you need a battery?
Age of battery Battery will not hold a charge (check with a volt meter) A fully charged battery should read approx. 12.8 volts (without engine running) If charging system is working properly reading should increase to approx. 13.8-14.2 with engine running. If voltage does not increase with engine running could be a problem with charging system of battery is defective and will not take or hold a charge
