Note - the above answer states that you should disconnect the negative cable from the battery. 'The correct answer is to remove the POSITIVE cable not the NEGATIVE.constantly deadYour battery is there for starting purposes only- once you start the car, the alternator/generator takes over, and runs the cars electrical system (and recharges the battery)- if you start your car and then disconnect the battery, if your alternator is good, the car will keep running. bad alternator and the car will die. note that if your alternator is bad, your car can run off the battery for a while till the battery dies. sure sign of bad alternator = constantly dead battery. Additional Answers
Turn car on remove positive battery terminal if car turns off alternator is bad
When your battery does not get charge.
Typically you know your alternator is out when you have to jump start your car numerous times. A way you can test it is by turning on your car and while it's running discount the + terminal. If the car turns off then your alternator is bad. If the car remains in then alternator is good and possible bad battery. Hope this helps
If it is makeing a noise or is not putting out at least 13.5 volts it is bad. Take the car or the alternator to an Auto Parts store and have them load test the alternator to be sure.
A bad belt, a bad regulator in the alternator or bad brushes in the alternator.
If the alternator fuse is bad, the alternator is not going to work properly to charge the battery. An alternator runs off the serpentine belt, with graphite brushes inside that conduct electricity to charge the battery.
with vehicle running pull posative side battery terminal off if it quits alternator is bad
To test the alternator if funds are low, let the motor idle and remove the negative battery cable, if the motor dies its probably the alternator.
Check voltage with a voltmeter at the battery With engine running readings should be 13.8-14.2 With engine running hold a screw driver to the back of the alternator, if there is no magnetic field, the alternator is bad.
If your talking about cars... If you smell a burning smell, or your red battery light comes on then i would get your alternator checked out!
bad alternator, bad voltage regulator, bad battery, bad connections.
You can have it tested at a auto pars store like autoZone. Another symptom is that if it has power issues, its the alternator I have the 03 LS and it needs a new alternator.
advanced auto parts stores can check it for you
A warning light on the dash would illuminate.
The alternator is belt driven and so is the water pump but that is where the correlation ends. There is no way a bad alternator could cause a water pump to go bad unless the alternator pulley was warped. Then there is a small chance.
alternator is bad
Spark Plugs do not affect your alternator. As long as your engine is running then it should be charging unless your alternator is bad
a bad ground wire can ruin an alternator by not completing the circuit
Start the vehicle then disconnect the battery. If the motor dies, you probably have a bad alternator.
A bad alternator will not give proper power to the vehicle. Dim lights, buzz in the stereo or a dead battery could all be causes of a bad alternator.
go to autozone and get a free charging system check.
If your battery doesn't hold a charge while running then your alternator is bad
let the car run and then pull the negative battery cable off. if the car stalls, the alternator is bad! do you know where the bank 1 o2 sensor 2 is?
bad alternator cable/corrosion bad battery
it can be caused by a bad alternator