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Altenator problems intermitently not charging battery.stops on idling

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  • Cars & Trucks Master
  • 682 Answers

If it is intermitant, it could be the brushes in the alternator are sticking and losing contact with the armature. The other problem it could be is the excite wire going to the alternator may be corroded, that is the smaller wire that is on a plug in connector.

Posted on Feb 09, 2012

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Posted on Jan 02, 2017

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RonPark
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SOURCE: will not charge battery altenator is good

Check the ground cable at both ends for a good tight and clean connection. also check that the alternator is grounded. You don't say if the battery goes dead over night or how you think it is not charging but if it takes over night. You need to check for a draw on the battery. You can do this by making sure all doors etc. are closed and things are off. Then disconnect the negative cable from the battery and hook a test light between the battery and the cable end, if it lights you have a draw. Something is on and draining the battery. Then you have to find what is draining the battery. You can pull fuses one at a time to find the circuit and go from there to pinpoint the cause

Posted on Dec 20, 2009

jschoon77
  • 55 Answers

SOURCE: Altenator issues

Kenneth, have you checked amperage draw on this vehicle? To me, it sounds like you have a component that is staying powered up even with the key off, which could be a component issue or a wiring issue.

You should check for an amperage draw with the key off by doing the following:

Be sure that key is off. You will disconnect the negative battery terminal and connect a Digital Volt/Ohm Meter (DVOM) with the black lead on the battery terminal and the red lead on the cable end ( the cable should not be touching the battery at this point).

Set your DVOM to the amp setting (A) and check what the meter reads. You should wait at least 2-3 minutes before you get an accurate reading as some components, such as the engine computer, may take a few minutes to power down fully. You should see a 0A reading at this point- if not, you have a big draw and should not continue to prevent damage to your DVOM.

If you are reading 0 in the A scale, switch to the miliamp (mA) scale. You should see less than 500 mA (0.5A) reading- this is a general rule of thumb as some things, such as clock memory, radio memory, ECU memory, etc will create some draw, but even 0.5A draw will take several days to draw a battery dead.

This will at least tell you if you have a parasitic draw on the battery causing it to go dead.

Hope this is helpful!!

ASE Master Technician with L1 and X1 certs, Nissan Certified Scope Technician, Chrysler Certified Level 3 Silver Technician- 12+ years experience.

Posted on Nov 17, 2008

  • 5 Answers

SOURCE: Charging problem

It could possibly be the earth cables from the battery, if the circuit is not made then it will not charge the battery, try to find all points were there is a wire that is bolted to the chasis remove them and clean them up, using a bit of vasaline when you re-fit the bolts would help to create a better current as well.

Posted on Jan 19, 2009

  • 6982 Answers

SOURCE: 1995 Jeep wrangler not charging properly

lf you have replacement cable ends on your battery, check that wires are not corroded under the straps. Also check alternator ground (run a ground wire directly to the alt case) I have seen "lazy" regulators at times but this is very rare. Also make sure drivebelt is tight enough to prevent slipping. Has your battery been charged and load tested?

Posted on Mar 29, 2009

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There are a lot of variables here. I don't know anything about your car except your described problem. But first off guess, (That is what this is), you have a dying battery. it isn't storing enough electric to run your car at low idle, when you have little charge from altenator & lights, heat etc. are heavy load items. You may also have a failing charging system. Most local parts store will test your battery & charging system for free, in the hope of selling the parts to fix it. You don't have to buy from them, but if they are nice enough to test it for you, you should at least consider them. The last possible, which should have been your first check, is your altenator belt tight?

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The first question for you is, What is the charging output for the altenator at idle?? If less than 12.3 volts, replace altenator. Typically, the altenator gets tested at 2500-3000 rpm on a bench tester. Your problem may be in the low rpm output range.

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could be loose connection or cable s not tight enough. Or altenator isn't charging properly.

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lf you have replacement cable ends on your battery, check that wires are not corroded under the straps. Also check alternator ground (run a ground wire directly to the alt case) I have seen "lazy" regulators at times but this is very rare. Also make sure drivebelt is tight enough to prevent slipping. Has your battery been charged and load tested?

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Battery charges when idling but not at speed. 81 datsun


This sounds like the altenator belt is loose. When the altenator is under a load the magnetic field causes the altenator to require more fource to rotate. At higher engine rpms the belt can be slipping on the altenator pulley. There is one other possibility I can think of and that would be that the voltage regulator is faulty and and causing an overvoltage at higher engine speeds and therfore opening up the field circuit to prevent the altenator from over charging the battery this is a safety function of the regulator. I would check the belt first.

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with the engine idling, check the voltage at the battery terminals. if its between 13 and 14.6 volts the alternator is probably ok. If its below 13V you need a new alternator. above 15V same thing.
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