Question about 2005 Chevrolet Impala

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Battery checking good, alternator good, but battery having to be jump started at different times.

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Check to see if there is a light on and if you have a aftermarket radio, it is hook up and still running when the car is off. check it out

Posted on Jul 31, 2010

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Check that the battery cables are not corroded and that they are making good contact with the battery.
Also when you said battery was good, did you have the whole system checked (ie the charging system) or did you just check the voltage?

Posted on Aug 05, 2010

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3 Answers

Wont start no ignition lights


Hi, You should check the battery and alternator one or both may be bad. Have your mechanic check it out for you. Good luck.

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Why does catera starts and runs great than other times won't even turn over and we have to jump. checked alternator-good battery-good ?


Check that all your ground wires are well attached and attaching points are clean and free of corrosion. Also check for parasitic drains such as an underhood light, trunk light, map light, floor lights, something plugged into dc outlet like a cell phone charger left plugged in, etc. is not draining your battery overnight or over time when parked.

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No power but full batteries


Get out your volt meter and check the battery voltage, should be about 12 volts, then turn the key and see how far the voltage drops. If it drops below 9 volts or so, you probably need a new battery. Sniff around the vents of your alternator around fuse box, see if you can locate what actually fried..would suspect the alternator if this happened after driving the truck. The alternator charges the battery as you drive. If it is not functioning the engine will drain your battery until the vehicle dies, and probably wouldn't start even with a jump. Not real sure how to test the alternator without the truck running. Running voltage should be around 14 volts with a properly functioning alternator.

Dec 11, 2013 | Ford Cars & Trucks

1 Answer

Alternator changed, now car will not start


Check cable between engine/gearbox and chasis, or bypass this cable during jump starting,by putting the - jump cable on the engine, if it starts your cable between engine and chasis has a bad connection.

Good luck

Jun 30, 2012 | 1991 Toyota Corolla

1 Answer

Car needs to be jumped or will not start


Car starts fine with a jump? You sure your battery is good? If the battery is good then you must have a connection bad right at the battery. If you jump it and it starts then the starter is ok. If you jump it and it stays running with lights on, heater fan on, etc. then the alternator is probably ok. The alternator won't keep the car from starting, but it might not let it start the next time if it is not recharging the battery. Please rate my answer so I am rewarded points for it.

Feb 01, 2012 | 2000 Mitsubishi Mirage

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Whenever i start my hyundai xg350L it makes a clicking noise, and won't start. i have to get a jump every time i go to start my car. can you tell me what might be the problem?


battery terminals may be dirty or loose, or battery may be a bit low. first clean and tighten terminals. If this doesn't work, you may have a failing alternator. If you have a voltmeter or there is one in the car, jump start the car, remove the jumper cables and check the voltage at the battery. If it is less than 14 volts, replace the alternator. let me know if you have any questions.

Dec 07, 2010 | 2002 Hyundai XG350

1 Answer

Car won't start.


It sounds like you have a bad alternator. Put a voltmeter on the alternator output to ground and see if you have at least 13.2 volts. If you dont, replace alternator.

Oct 28, 2008 | 1998 Pontiac Grand Prix

1 Answer

2002 4.0L Jeep Grand Cherokee


Sounds like an intermittent bad voltage regulator inside the alternator,although it could possibly be a loose wiring conecton.You are doing good by checking system voltage at the battery with the engine running.Check for clean tight electrical connections at the battery and at the alternator.Also check grounds.

Jun 30, 2008 | 2002 Jeep Grand Cherokee

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