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Fitted a new alternator but charging light still shows red and is not charging battery

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2 Answers

BATTTERY NOT CHARGING


Is there any dash lights on? Check the alternator fuses!

Nov 08, 2015 | Cars & Trucks

1 Answer

2003 Saturn vue awd 3.0 testing showed alternator putting out about 1/2- we replaced the alternator & the serpentine belt,- red wire?the new alternator in did not solve the problem-battery is new-


How do you know it's only putting out about 1/2 ? an 1/2 what ? Amps or volts ? Did you hook up a volt meter to the battery posts ? red to red an black lead to negative post of the battery ? Does it show 13.1 to 14. 1 volts with the engine running , if so it's charging . The only thing that would cause the alternator not to put out full charge amps would be a bad diode inside the alternator or a power or ground issue. You need to check power an grounds doing a voltage drop test . Voltage Drop Testing the Charging System

Oct 26, 2015 | Saturn Cars & Trucks

1 Answer

Alternator stays on 13v for a couple of seconds then jumps to 14v,putting on lights and radio and heater causes no change.


thats correct it suposed to do that thats how it charges the battery if the ignition lights flicker make sure that the wire lomb in the back of alternator is pressed in correctley was it a new audi part or an after market one as i have had many problems with after market parts for my mercedes so if i can afford them i stick with them hope this helps ivan ps there is also a relay that sends current to the battery not sure where that is but it determans when to send voltage to battery to keep it charged

Sep 28, 2012 | 2005 Audi A4

1 Answer

We changed the alternator and now we have a red light in the dash for battery


the red warning light comes on when there is low charging voltage test for charging voltage between the alternator and battery should be roughly 14 volts

Sep 21, 2012 | 1986 Lincoln Mark VII

1 Answer

Can a Volage Reglator on a 2000 Chevrolet Lumina keep it from starting?


the voltage from the big red wire is battery power
the smaller wire will not have voltage until the alternator is running
one wire goes to the charge light to the voltage regulator
check that the voltage regulator is operational
better still get an accredited auto electrician to check the charge circuit , voltage regulator and alternator for operation

Apr 12, 2017 | 2000 Chevrolet Lumina

1 Answer

1992 bronco will not charge. New alernator, new battery, new 3/0 ground wire from battery to frame, frame to engine block, frame to alternator. harness from alternator to battery ohms good (.4ohms) what am...


On some of the earlier fords. If the bulb is blown in the instrument panel. It will not complete the circuit to charge. Turn your key on with the engine off to see if the red light comes on that shows the battery.

Jun 27, 2011 | 1992 Ford Bronco

1 Answer

My mom has the same problem w battery w. chrysler 300m(2002) she allready replace w. new battey then chrysler service dept. told her the battery was fine n replace her starter now electric shop says it is...


Sounds like alternator if the battery is not staying charged or the output from alternator the big red wire is lost connection to battery +.
a voltmeter you can check with across battery and it should show minimum 13.8 volts minimum to be charging.
if the battery is low it should show 14.7 volts if it shows 12 volts or less with lights heater etc running then alternator is not charging.
You can get a cheap volt ohm meter from radio shack or walmart and use the DC setting 20 volt scale on meter and start the car and turn on everything and put the test leads of meter across battery terminals and see what the voltmeter says.

May 18, 2011 | Chrysler 300M Cars & Trucks

1 Answer

Hi there i have fitted a new


When you turn on the lights or fan there is a draw on the system causing the alternator to kick in, therefore the higher voltage. Probably without them on and your battery is charged, the current would be less or none and you may just be measuring the battery voltage. If you discharge the battery the charging voltage will probably go up because then it will be in a charging state. So your new alternator is probably OK.
You can test it by driving --if the battery becomes discharged, then the alternator is not working

May 08, 2010 | 2005 Subaru Impreza

1 Answer

How can I check voltage on alternator? I have put a new battery on diesel passat. after a few days , the battery is flat and I havre to put on charge/ the red light is not on. tony@obmtec.com


Try changing the alternator - it may be cheaper in the long run - used spares can be very reasonable and an alternator is easily fitted.

If the diode valve pack has gone in the alt. then the readings would be out anyway - this is the more common fault.

Apr 30, 2010 | 2002 Volkswagen Passat

1 Answer

Battery light


1st thing to check would be the alternator, to make sure it's charging the battery. If it's not, the red battery light would come on. Most major parts stores offer free battery and charging system checks, they can tell you if the alternator is not charging. Have it checked asap, as the new battery will be dead soon if it's not being charged. countrycurt0

Aug 31, 2008 | 1998 Chrysler Cirrus

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