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Bailey Green Posted on Apr 18, 2017
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Alternator not charging battery on Lexus gs300-1998.No battery signal. All other warning signals appeared. Car started right up after a jump,cut back off less than 500 feet away. What can it be?

1 Answer

John Hong

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  • Master 787 Answers
  • Posted on Apr 18, 2017
John Hong
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Joined: Sep 27, 2008
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1. Remove the battery and put it on a charger overnight, see if it holds a charge. If not repair the battery.
2. If the battery holds a charge, replace or repair the alternator' Good chance the brushes need replacing.

5 Related Answers

Anonymous

  • 360 Answers
  • Posted on Oct 21, 2008

SOURCE: Car wouldn't start couple of

theres a tsb for a faulty fuel pump........ Access the fuel pump connector.
Monitor voltage between the White/Red (WH/RD) and Black/Yellow (BK/YE) wires, leaving the fuel pump connected. Also monitor the fuel pressure.
Voltage will normally be about 6-8v at idle and will increase with load on the engine.
Drive the car to try and duplicate the complaint. When the problem is occurring, check the fuel pressure vs. voltage to the fuel pump. If pressure is dropping but voltage is the same or increasing, check the connections right at the fuel pump. If OK, drop the fuel tank, inspect the lines internally and replace the fuel pump as needed.

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Anonymous

  • 48 Answers
  • Posted on Jan 28, 2009

SOURCE: battary light on , engine cut off car won't crank

sounds like it's your alternator, your alternator charges your battery and runs car once it is started. if you have a bad alternator your battery light will come on, and shortly after your vehicle will die, unable to restart without a jump. I would take your battery to autozone or an auto shop to have your battery and alternator tested.

Anonymous

  • 835 Answers
  • Posted on Dec 06, 2010

SOURCE: My master warning light appeared

well what happen is w/batery dead the computer detected a problem if battery is full now & cranking fine just reset computer unhook neg, cable this reset it they usaly reset thm self after 30-50 cranks if no problem is found

Anonymous

  • 1654 Answers
  • Posted on Mar 13, 2011

SOURCE: Saab 93 1.9 tid warning

The easiest way to check is with the car running, disconnect the positve side of the battery, if the car dies, then it is the altenator, if the car keeps running then it is the battery. If you have a volt ohm meter, check the chrge going to the battery you should get between 12 and 14 volts if it is lower than 12 you have an altenator issue. the altenator should always produce enough to charge the battery and run the car at the same time, if not then the battery wears down.

Philip Armitage

  • 437 Answers
  • Posted on Oct 21, 2011

SOURCE: Daughter called me ..car wont

it sounds like you have blown fuse to the Alternator.. I don't know what car you are talking about but they charging systems vary.. But if alternator isn't getting all the power it needs it won't charge. this should be checked.

good luck

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Can I jump start my car if it is dead due to a bad alternator?

You can, but the battery will go dead again. The alternator is what keeps the battery charged and with out it charging there is nothing to keep a charge in the battery. The car uses power to run, not just to start, plus brake lights, turn signals, and radio, A/C all use power.
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Yesterday i was driving my 2002 range rover and the "gearbox fault" message appeared. after my RPM and speedometer dropped to zero any time I tap on brake. Main console went blank and then lights...

It does sound like the alternator isn't working. Did you have to jump the vehicle or charge the battery to get it to start back up? If you did not have to do either the possibility of the alternator working is good. The car will run with less power in the battery then what it takes to start the car. If you did not have to jump or charge battery to get it started again you might be better of checking for loose or corroded connections and most likely a maim power cable or wire. A bad diode in the alternator can also cause what you described due to the alternator putting out an AC current the computers and electrical components won't work right they were built to handle DC current. If you don't have the proper test equipment to test for AC current just disconnect the alternator while the car is acting up and if ever thing goes back to normal you will know it is the alternator. You are going to need at least a volt meter. The voltage while the engine is running should be 14 to 14.8 volts.

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My 2004 Lexus RX 330 has 105,000 miles and has recently not started twice. I had the battery jumped and it cranked right up so I charged the battery to a full charge, The next day, the car cranked right up...

Sounds more like the Alternator or Voltage regulator is not charging the battery correctly. Have the Alternator checked. If you remove it and take it to Auto Zone or Advance Auto they should be able to test it for you.
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Vehicle was parked and not started for 2 months.

Hi, there will be diodes in the generator that are letting the power from the battery drain away through the parked times when not in use. to prove it charge the battery- then disconnect the negative terminal on the battery, connect 24 hours later and see if the battery as kept it charge, if so - fit new alternator, good luck.
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Have your alternator checked. Most auto supply places do this at no charge. Multiple dashboard warning lights usually indicate alternator problems.
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Air Bag Light, Brake Light, & ABS Light came on in the dashboard.

Check and see if your alternator is charging
Low voltage will cause those lights to come on, as the computer is shutting down.

To check your alternator you will need a volt meter... WITH the engine running you should have about 14 volts coming out. IF NOT you need to replace the Alternator!
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Battary light on , engine cut off car won't crank

sounds like it's your alternator, your alternator charges your battery and runs car once it is started. if you have a bad alternator your battery light will come on, and shortly after your vehicle will die, unable to restart without a jump. I would take your battery to autozone or an auto shop to have your battery and alternator tested.
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Sometimes the new battery is not 100% charged. Put it on a charger or jump start the car, the alternator should then charge up the battery.
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