I just replace my battery because i am pretty sure that my alternator had a faulty connection to my battery so it was not getting power from the alternator. So i replaced the battery, cleaned out all the connection from the battery cables to the alternator thinking that maybe because it was so gunked up that metal was not touching metal therefor no power. Seemed to work, we checked the charges all had 12v. But the last few times i turned the car on my battery light was coming on....what could be the problem???
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Re: battery and alternator
If your alt is putting out 12V you have a faulty alternator. A healthy alternator puts out 14v not 12v. The battery light doesn't indicate a bad battery, rather it indicates voltage is below 14v or 13v, depending on the vehicle.
With the vehicle running use a voltmeter at the alt and test for output voltage, if it's any where close to 12v you have a faulty alt and will need to be replaced.
You could also have a corroded/faulty/loose battery cable/s going from the alt to the starter/battery/alt.
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Hi Andy Well Normally if you have to get it to 3000 rpm to get lights out and start to charge I would have said faulty alternator. If your sure alternator is ok I would check the pulley belts are not slipping ignition off key out grab belts and give a hard tug on belts is there any slackness or abnormal movement (possible broken mount or bracket). If all good remove belts and make sure all pulleys that the belts run on turn freely and none are seized or sticking. If all good grab a set of jump leads connect the black earth cable to a good known earth on the engine and the other end to the negative earth terminal on the battery make sure both connections are clean and secure. Start vehicle has fault gone? if yes faulty earth connection between engine and chassis locate and repair as required. Fault still apparent check power side make sure all connections are clean & secure . wiggle test at battery terminals (all connections) Check at alternator starter motor is there any discoloured wiring (over heating) wiggle test all connections. Before wiggle test make sure you are able to disconnect the battery earth terminal quickly if required. Remove it 1st as a test run but make sure it is secured when testing. If all the above fails to rectify the fault get it to a Holden dealer as more in depth testing will be required Good luck
Clean all connections and make sure they are sound on both the battery and alternator. Electricity does not like to flow properly through dirty and poor connections.
If your alternator is not pushing charge at over +13V(sometimes over 14V, all depends) when the engine is running, then it is faulty. Take it back to where you bought it from and exchange for another.
If the alternator is fine whilst running and the battery shows 9V when the engine is stopped, then your battery is not holding the charge and is faulty. Take it back, same as if the alternator were faulty.
By rights, all things being equal, once started, your engine should run without the battery being connected at all, if your alternator is operating correctly. Your battery is only a storage device to initiate engine ignition. They are rated by CCA, which is simply crank power to turn the engine over and start.
faulty alternator or battery, loose battery connections at battery end or starter end. Check battery for its ground connection, make sure all connections are clean and tight. Alternator is my first choice as the culprit.
SOUND LIKE FAULTY ALTERNATOR. CHECK ALTERNATOR VOLTAGE OUTPUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR IS FAULTY. CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR LOOSE CONNECTIONS OR DAMAGED WIRES,CHECK ALTERNATOR FUSE AND MAKE SURE DRIVE BELT NOT SLIPPING DUE TO BAD BELT TENSIONER. TURN OFF RADIO FIRST BEFORE REMOVING NEGATIVE BATTERY CABLE TO KEEP FROM LOCKING OUT RADIO.
As a first course of action, I strongly suggest that you
have the battery charged. It can be an indication of a weak battery or a faulty
alternator. If the battery light still on after charging then the problem will
surely be on the alternator itself. If that's the case the alternator should be
replaced to resolve the problem.
You may try to reset it to by removing the positive battery
connector, letting it sit for at least 5mins. then reconnect it again. This
will reset the system and can get the battery light off.
Hope this helps and thank you for using FixYa! Have a good
CHECK BATTERY VOLTAGE IT SHOULD BE 12.5 VOLTS.IF NOT HAVE BATTERY CHECKED OR REPLACED.MAKE SURE BATTERY CABLES + BATTERY POST CLEAN FREE FROM CORROSION AND HAVE TIGHT CONNECTION.IF BATTERY IS WEAK.YOU HAD IT REPLACED CHECK TO MAKE SURE ALTERNATOR OUT PUT AT BATTERY IS 13.5 - 14.5 VOLTS WITH ENGINE RUNNING IF NOT. ALTERNATOR FAULTY.IF BATTERY AND ALTERNATOR OKAY.CLICKING NOISE COULD BE STARTER FAULTY OR POOR NEGATIVE GROUND BATTERY CABLE.
MAKE SURE YOUR BATTERY CABLES ARE CLEAN AND TIGHT.MAKE SURE YOU ARE GETTING GOOD GROUND AT NEGATIVE BATTERY CABLE.IF BATTERY CABLES VERY OLD REPLACE THEM.IF ALL IS GOOD ALTERNATOR HAS LOOSE B+ WIRE AND FIELD WIRES CONNECTIONS MAKE SURE NONE OF WIRES DAMAGED AND ALTERNATOR DRIVE BELT NOT LOOSE SLIPPING.IF ALL GOOD YOUR ALTERNATOR HAS THE WRONG AMP AMPS TOO LOW HAVE WRONG ALTERNATOR. OR YOU HAVE FAULTY ALTERNATOR.