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Why would the Battery light still be on after replacing battery? How you do know if it is the alternator?

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Turn vehicle on., leave running. take the positive cable [red] off the battery. if vehicle still runs, altenator is good. and maybe the terminals need cleaning.and last, check fuse... good luck. rick

Posted on Nov 07, 2010

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Brake and battery light on new battery and alternator installed


Wouldn't be a fuse, but it seems as if the alternator is still not putting out normal power, or else your battery has a problem taking a charge. Better have the battery tested for a dead cell. also see what a voltmeter says about alternator output now. If you have an electrical problem in the wiring somewhere or in the alt. charging controls, then possibly one or more of the diodes in the alternator may got burnt out. That means the alternator puts out less power.
On some newer cars, the engine computer, pcm, controls the rate of charge of the alternator. So you have to be careful diagnosing -know how your system operates. That's why mechanics always ask for year, make, model, and engine size if applicable.

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My battery light is on,I just replaced the alternator and battery but my lights are still dim and the battery light is still on??????


Check the fuses! Many times I have replaced alternators just to find the fuse was blown that tells it to charge. This doesn't mean the alternator wasn't bad, that's what causes the fuse to blow. Just my guess, not knowing anything about what make or model it is.

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Supposed to mean the battery is not being charged.
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This is easy to test but you need a multimeter. Connect the multimeter to the battery and run the engine at a fast idle (say 2000 rpm). You should get a voltage reading anywhere from 14 to 15 volts if the battery is fully charged and the alternator is working. If the reading is around 12 volts, then the alternator is not working.

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1 Answer

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ITS EITHER ALTERNATOR OR ALTERNATOR WIRES BROKEN OR DAMAGED.IF ALTERNATOR WIRES LOOKS OKAY.I WOULD REPLACE ALTERNATOR AND BATTERY CABLES.WHEN BATTERY LIGHT COMES ON ALTERNATOR IS NOT CHARGING BATTERY.REPLACING BATTERY TWICE A YEAR IS CHARGING PROBLEM.ALTERNATOR NOT DOING ITS JOB.IF YOU BUY ANOTHER ALTERNATOR BUY CORRECT AMP ALTERNATOR BUY WHAT FACTORY PUT IN.

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2 Answers

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THE RED LIGHT SHOWS WHEN ITS NOT CHARGING I WOULD GET THE VOLTAGE CHECKED SHOULD BE PUSHING 13 TO 13.5 VOLTS WHEN CAHRGING

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2 Answers

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CHECK ALL WIRES THAT GO TO ALTERNATOR.CHECK BATTERY BY TESTER( LOAD).CHECK WIRES FROM IGNITION SWITCH (YELOW) WITCH GO TO ALTERNATOR.AND CHECK GREEN RED WIRE WHITCH GO TO ALTERNATOR WITH IGNITION ON. IT SHOUD BE 12V AND WITH ENGINE RUNNING IT SHOUD SHOWS NOTHING.IF EVERY THINK OK - REPLACED ALTERNATOR.WITH EVERY THING OK VOLTAGE SUPOUS TO BE 13.8 - 14.5 V

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