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The battery wont stay charged

I put a new battery and alternator but my battery wont stay charged

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: 1988 chevy suburban charging system

First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!

Posted on Jan 07, 2009

GM Elec
  • 1000 Answers

SOURCE: battery wont cahrge up

First, disconnect the negative battery cable at the battery.
Second, disconnect alternator wires, one connector and one fuseable link attached to the stud.
Third, reconnect the battery cable to the battery.
Fourth, turn the key to the run position and check for voltage on all three wires, all three should light a test light.
Let me know what you find.
Regards,

Posted on Apr 11, 2009

  • 72 Answers

SOURCE: battery wont hold charge

Have you had the battery tested? (a new battery can still have a bad cell)... also, check all leads from the alternator for tightness and correct terminal location. If that's all good, then it sounds like a short if it is slow draining the battery. Check that all items in the car are off and unplug any chargers you have from the cig lighter, also check that the glove box light is not staying on when shut.

Posted on Jun 08, 2009

localwonder
  • 6784 Answers

SOURCE: the alternator is good, new battery , wont stay

Ok, i understand that you have replaced the alternator, but there seems to be a non charge state in this case. i recommend checking the charging system. use the procedure below to isolate this issue.

Wear protective eye wear and clothing and remove all jewelry when checking your battery and charging system. Jewelry is a good conductor of electricity and is not recommended. Most batteries wear out every 3 to 5 years and need to be replaced. Always replace your battery with an equal replacement battery to assure proper operation. Automotive batteries have a +positive terminal (red), - negative terminal (black). The battery in this illustration has a protective cover over the positive terminal to prevent short circuit in case of an accident. Electricity is stored in the battery and then supplied to the vehicle when the engine is not running. While the engine is running the vehicles alternator charges the battery for future use. (Note: never disconnect the battery while the engine is running. If the battery cable is disconnected from the battery a spark can be generated which can cause the battery to explode or a major electrical malfunction to occur.)

To check a battery surface voltage, remove the positive terminal protective cover. Connect the +positive side meter lead (red) to the positive side battery terminal. Connect the - negative (black) side meter lead to the negative battery terminal. With the vehicle not running and the car sitting over night the battery voltage should be between 12.5 and 12.8 volts.(You will need to use a voltmeter for this testing procedure)

The alternator is rotated by a drive belt driven by the vehicles engine while it is running. Electrical voltage and amperage are generated to recharge the battery and supply voltage to the electrical system of the car. The alternator is held in place with mounting bolts. There is a main electrical wire on the rear of the alternator that supplies voltage to a main voltage junction box. If your alternator is not charging properly, your battery will slowly drain down from operating all the electrical systems in your car and stop the car from running.(most non charge states will be the cause of a loose belt or a low tension rate, due to a mis-adjusted alternator. make sure you have enough tension in the belt for full rotation of the alt pulley)

Next, you will need to check the alternators output with the Amp meter.

Testing the amperage output of the alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage. Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter is needed. Once the meter is connected start the engine. Next turn on all electrical accessories and raise the engine idle to about 1200 RPM. The alternator should output the max amperage it was designed to produce. Example: a 90 amp alternator should output about 88 amps. Note: An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail. An alternator is designed to operate at max amperage output only for a reasonable amount of time.

((Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive) at engine idle the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.)))

Posted on Sep 30, 2009

caroldon
  • 17129 Answers

SOURCE: My van looses battery charge. Just put a new

Before the alternator was replaced it was important that the charging current was measured with an ammeter to confirm charging.It is possible that the rectifier/regulator to the alternator is faulty.This electronic control unit determines the charging current.Please check this unit in your car for failure.Check this link for tips.


http://www.fixya.com/cars/r5824824-draining_car_battery_charge

Posted on Sep 29, 2010

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Won't stay running


I am guessing that you put in a new battery drove it for a day at most and went out the next day and it wont start. Well if this is true then you will need an alternator, your battery is not being charged. Your car can start a run without this but you wouldn't get that far and eazy way to figure this out is either charge your battery or have a friend jump, be sure to let it charge for 3-5 min. before trying to start.
If it starts than remove the jumper cables and let the car tun for another 2-3 min and turn it off. If you cant restart it than you will need a new alternator

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