Yes. an alternator can be good but you can still have charging problems if:-
1.Battery is no good.
2.Fan belt slack or worn.
3.Poor or broken wiring connections at alternator.
4.Loose or dirty battery conections.
5.poor or broken wiring between alternator and battery.
6.Alternator rating not large enough for application.
If the alternator is good then the battery is bad.
battery tests good, alternator tests good, new voltage regulator installed and still no charge to battery from altanator .
The battery may be defective and not able to take a charge.
put in new alternator but it will not charge battery. alternator was tested and found to be good. why wont it charge the battery?
If the alternator is good and the battery does not charge, then the battery may be bad. There could be problem with the electronics. You will need to take it to a place where they sell batteries. They have equipment to check out the battery and the wiring.
That is the purpose of an alternator. The keep the battery charged and to run all the electrics on the vehicle. However it is never a good idea to allow the alternator to charge a dead battery. This will put a strain on the alternator and may damage it.
The official charge of a battery is measured by the specific gravity of the electrolyte. For a good battery and alternator, full charge is noted when the alternator output current is just enough to carry the load, plus a bit to maintain the battery, and the battery voltage is normal.
If you are 100% sure the battery and alternator are good and the battery is loosing it's charge then something is on pulling power from the battery. Can be any light or any relay on the vehicle.
Charge and load test battery- it may be not able to take a charge and need to be replaced You may a have blown fuseable link preventing alternator from charging battery
is your battery Low or poor?? Charge your battery on slow charge for 8hrs to give it a good deep charge, Installing an alternator on a low or dead battery will ruin it and also not charge your battery properly.. An alternator is not a battery charger its a battery maintainer!!
New batteries almost always come fully charged. If it was not then charge it with a battery charger and do not use your vehicle alternator to charge a dead battery. You may do harm to the alternator which is not built to charge a dead battery but is instead built to keep a good battery fully charged.
Has the battery been tested, does the alternator on the Durango try to charge?... If the truck runs with the battery but the battery doesn't take or hold a charge, it has to be the battery being bad or extremely bad terminals so that the charge can't reach the battery. Age of the battery doesn't matter, a fairly new one can still go bad.
could be a bad battery
Loose or corroded connections or the battery has a dead cell and will not accept a charge and must be replaced.
Install a good generator or alternator.
If you charge the battery and it is not working then there is something wrong with the battery. Batteries are not usually repairable.
Start the truck then disconnect the battery if it's still running the alternator is good
Obviously check the battery. Anyway, if the alternator, battery, and wires connecting them are good the voltage regulator is next on the list.
If you are 100% sure the alternator is good, then either the wiring or the battery are bad. If the battery has a dead cell it will not hold a charge. Disconnect the battery cables and clean the connections. Charge the battery with a battery charger, and then connect the cables. If the battery is over 3 years old, it is more than likely bad.
the battery could have a dead cell, this could cause it to not charge. Have the battery tested to be sure.
Does the Alternator have a power supply back from the battery to excite the alternator? I had the same problem and despite trying several alternators found that a fuse had blown on the circuit bring power back from the battery. Or the bushes in the alternator could be worn out or the diode pack could be shot. Put a volt meter onto the small wire on the alternator and across to the vehicle body you should have battery voltage on this terminal.
No, that is normal. An alternator is good working order will output between 13.5 to 15.5 volts.
bad pcm regulator
battery and or alternator are shot, check alternator by starting the car, and removing either the positive or negative battery cable,,, if the vehicle continues to run the alternator is good.