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Alternator not charging battery. Alternator itself checked and is ok. What else could it be?

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Start the car and then pull the pos battery cable if the car dies its your alternator...their test equipment is only right about 30 percent of the time

Posted on Aug 25, 2008

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freetek
  • 5568 Answers

SOURCE: 2002 sonata 2.4l battery dash light on. replaced alternator. Still not charging

I don't know if your car has an integrated regulator or not; some house the regulator in a section of the alternator case, others mount it remote from it. The regulator monitors the load and battery voltag,e primitively but effectively, and controls the current flowing through the field winding of the alternator to ground, changing the magnetic field intensity and consequently the voltage output of the alternator. The 'hot' end of the field is internally connected to the + output, the 'cold' end is controlled by a transistor inside the regulator which, in turn, is controlled by circuitry monitoring the system voltage.     Some alternators can be tested by sticking a wire through a specified opening, actually shorting the controlled end of the field to ground briefly, while monitoring the voltage across the battery, doing this though for seconds only. This essentially bypasses a suspected defective regulator; this causes the output voltage to rise instantly to its maximum of ~17 volts if the alternator is OK.
I don't recommend poking a wire at random into an available opening so having a service manual (Haynes-Chilton) would be nearly mandatory.

Posted on Oct 03, 2008

  • 193 Answers

SOURCE: Charging Light On After Replacing Alternator/Battery1999Windstar

Hi, I can't tell you exactly what is wrong because there is too much involved at this point, what with 2 shops working with it, but I can give you some advise on what else to check. On the alternators and the wiring that supports them a small volt charge is taken off one of the slip rings, where the brushes ride, for the purpose of turning out the light. As I remember, this is a yellow wire that runs back to the dash.

To the alternator, it would be one of the wires that plug into the side of the alternator case.
jetski

Posted on Nov 27, 2008

  • 61 Answers

SOURCE: how to change alternator in a porsche boxter

To gain access to the alternator you have first disconnect your battery. After that you need to remove the passenger seat. Then remove the engine access cover and you will be able to remove the alternator and belt.

Posted on Jan 29, 2009

  • 114 Answers

SOURCE: 1996 dodge ram 2500 van alternator not charging battery

do a continuity test from the large red wire on your alt to the battery,could be a fusible link or broken wire,sometimes a wire will break within the sheathing so it won't be visible by eye,check all conections for corrosion and either clean or repair

Posted on Feb 21, 2009

csmock132
  • 4669 Answers

SOURCE: Battery dosn't charge, alternator/voltage adapter test's good.

Did you test the Alternator on or off the truck? It might be a problem with the control system to the Alternator. The regulator need a battery feed to work, It is usually ran through an alternator fuse.

Posted on Mar 11, 2009

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My alternator is not charging the battery checked alternator its OK. Checked wires to alternator OK what could it be


Not sure how you checked the alternator to say that it's OK, but if it's not charging the battery then it's not OK. You can take it to most auto parts stores and have it checked along with the battery to see which one is bad.

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I have a new battery and new alternator on my 1998-A4-1.8. The alternator will not charge the battery


Check for fuse and or give it a direct ground from the battery terminal and see what happens it should charge 14+V

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Brand new battery and alternator but the alternator won't charge the battery, why?


two possibilities that immediately come to my mind from past experience:

(1) check that 2-connector plug on the side of the alternator! if that is disconnected, or not connected tightly, the alternator will not work until the engine is revved up to about 3000. once the engine hits 3000 RPMs the alternator energizes itself and begins to charge.

(2) check the fusible links. they're in a small compartment next to the battery. I remember something about this happening to mine and it was a fusible link. there are 4 of them, the main one says "ALT NAT/BATTERY" and the next one says "IGN SW"... check those two. I'm willing to bet it's that fusible link. I remember that the car started ok but nothing else electric worked. furthermore, with that fusible link broken, the charge indicator (battery) light came on very dim when the ignition switch was off. did you accidentally short something when you did the alternator? I bet this is what's causing that.

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The alternator works, but the Batt lite stays on, and the battery is not bring charged. 1983 isuzu pick up.


You say the alternator works so I have to assume you have used an ammeter and checked the alternator output at various loads or engine rpm's to ensure it's meeting its peak charging output, am I right? So that means if the battery is not charging then the battery itself has a weak cell and is not charging or you have a loose connection at your battery or the wiring to the alternator itself is bad or not making a good connection.

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Check the charging system, clean the terminals.

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Meaning of red battery light on dash


Hello Mdeon.

The red light is indicating that the alternator is not correctly charging or not charging at all.
Basic check would be to verify that the drive belt is actually turning the alternator. A loose belt can do this.
If the belt is OK, then check the connections at the alternator for looseness or corrosion.
Check the main terminal at the alternator for 12.5 volts ignition key off.
Make sure the mounting bolts for the alternator are clean and tight.
If all that checks out, replace the alternator, it is defective.

Thank you for using FixYa.

KL

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Make sure that you buy a 'lifetime' warranted alternator from your parts source to avoid problems with bad alternators out of the box. I would try to return and exchange the alternator with one that tests out ok on a bench, in order to verify if the wiring in between the alternator or the alternator itself was bad.

Service brake booster would have to do with the vacuum or power booster problem around the master cylinder for the braking system. That wouldn't have anything to do with the alternator, I do not believe.

Good luck on these repairs.

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1 Answer

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Well in order to check the alternator you must have a fully charged battery. I would try to charge battery and see if it will take a charge. If not, replace it then test the alternator.

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Check your alternator as it sounds like it may be starting to go. The battery light trips when it detects an issue with the charging system. Very rarely, the battery light can trip if there's an issue with the PCM, but this is very rare.

Take a voltmeter with the car off and measure the voltage on the leads of the batter, should be around 12V+-.2. With the car running, measure again and this time it should read 13V-14V. If it does read 13V-14V then it means that the alternator is working. If it is below 12V, then it means your alternator is not charging the battery properly. If it's above 14V, then it means your alternator is overcharging and damaging the battery.

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Battery light stays on until I press the gas


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