If the alternator is good then the battery is bad.
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 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.
Inside the alternator
thers a new battery and alternator I'm bafeled
Fully charge the battery Check with a voltmeter (should read approx. 12.8 volts without engine running) With engine running and good alternator reading should be 13.8-14.2 if the battery is dead the car wont start. replace the battery (preferably with a new one) run the car and if it dies or wont crank again its the alternator (or possibly the alternator belt is slipping)
Dead cell in battery, defective alternator, or something is on pulling power from the battery.
There is something on that is pulling power from the battery. Any light or any relay that is stuck will drain the battery.
You probably have a bad battery. You probably have a bad battery.
Check fuses first. If fuses are good, check the voltage from the negative battery cable to where the wire bolts onto the back of the alternator. (With the engine running). If you can't reach the back of the alternator, then measure across the posts of the battery. Voltage should be about 14 volts DC. If lower than that, replace the alternator. When you replace an alternator, it's a good idea to replace the battery, as a precaution.
Dead cell in battery or the alternator is defective. That is assuming all words are connected and not corroded.
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