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You have a loose wire or cable, or have blown a fuse or fusible link somewhere. Check battery terminals, connections to the alternator, negative terminal to engine, engine to body, battery to body. A voltmeter is essential for speed and accuracy. A mechanic can sort this out in no time flat.
CHECK ALTERNATOR DRIVE BELT TENSION.MAKE SURE IT NOT TOO LOOSE.AND CHECK YOUR IDLE SPEED.IT SHOULD BE 700 - 800 RPM.IF IDLE SPEED TOO LOW ALTERNATOR WONT TURN FAST ENOUGH.BUT CHECK ALTERNATOR OUT PUT AT BATTERY.IT SHOULD BE 13.5 TO 14.5 VOLTS.IF NOT PROBLEM IN ALTERNATOR.CHECK ALTERNATOR FUSE AND ITS BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES.
this sounds like an alternator problem. first chechk wires on alternator and starter make sure they are nice n tight , clean batt terminals and check engine and chassis ground . if you have a volt meter check n see if the alternator is charging minimum 13.2 v anything less is no good allso if it is above 13.2 then turn your lights n a/c on iv voltage drops then alternator is bad.
It could be a multitude of problems, however the first thing I'd do is check that battery.
A lot of times, batteries just get wore out and even while being charged; they aren't able to help keep the system stable enough. Even with the alternator pushing out the right amperage, it may actually be causing more problems as it's not holding enough of a charge. Usually when the battery is fully charged the alternator will only power the vehicle itself while not charging the battery.
I'd try the battery first, then look into the wiring off the alternator. Also check for bad terminals, wire connections, or even corrosion on a ground contact.