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Alternator The volts keep going down

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How to do BSI reset on Peugeot 206

A meter will show a charge from an alternator but what charge was it . IF it is not 14.5 volts and DC volts not ac volts then the alternator is not working properly and that is why the light is staying on. Best have the electrics checked out at an accredited auto electrician shop.

Aug 24, 2014 | Peugeot 206 Cars & Trucks

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71 c10 not staying charged... new battery alternator fuses good and new voltage regulator

Maybe it wasn't running long enough to charge up the battery?
Stop trying to jump it, when you are having problems with it dying, take the battery off and have it charged. And/or buy a $20 voltmeter to see what the battery shows. If it says less than 12 volts, it is discharged, and needs charging. A good battery that is not run down should have at least 12.5 volts. A new battery that is charged should have very close to 13 volts, maybe 12.8 volts.
When you have the truck running, check the alternator for charging. You put the voltmeter right on the battery and check it again. This time, with truck running, battery should show at least 13.5 volts. That shows the alternator is working. A good alternator will put out about 13 or 14 volts-the regulator will keep it from going any higher to prevent problems, like a melting battery or electrical parts burning out.
I would say get the charging system working right, then address the problem of dying at stop lights. That could be a carburetor problem, if the alternator is working.

Aug 15, 2013 | Chevrolet Cars & Trucks

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Battery keeps running down on 96 cadillac elderado

if battery keeps running down. check the voltage across the batery posts while car is off.should be around 12.5 to13 volts. then with tester hooked up to battery, start the car. if alternator is ok, it while read about 14 volts give or take a few volts. if the gharging is low its a bad alternator or the drive belt.

Mar 09, 2012 | 1996 Cadillac Eldorado

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How can i know the alternator needs replacement or how can i check it and do u have instructions on how to remove it

you can check it with the car running at idle , with a multimeter check the voltage of the battery if you have arround 14 volt the alternator is good if the battery goes down under and keep going down it is deffect

Feb 08, 2011 | 2003 Nissan Altima

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The altenator is not keeping the charge to the batery....besides the fuse panel in the passager side is there 1 under the hood or another in another location?

Have you changed the alternator. The alternator may not be putting out enough of volts to keep the battery charged, also the alternator could be charging but the battery could have dead cells. What or if any parts have you replaced. Also what does the charge indicator on the gauge cluster indicate and do you have a battery light flashing on the cluster panel.

Aug 28, 2010 | 2004 Ford Expedition

2 Answers

My bravada sometimes stalls.The voltage goes down when I am at a stop .When I try to go,it doesn't want to go and sometimes stalls out.While I'm driving it's fine and the voltage is good.One time when I...

Have your alternator checked, the voltage regulator which is an internal part in your alternator may be going bad and when there is an electrical load. The alternator does not produce enough voltage. That a multi meter and check your voltage at the battery, engine not running you should have 11.5 to 12 volts.
With the engine running you should have 13.5 to 14.0 volt reading at the battery, turn on your A/C blowers on high and head lights on and you should still have a minimum of 13.5 volts at the battery.
If your readings drops less then 10 volts, the Bravade ECM will shut down the fuel pump or the voltage is to low for the electric fuel pump to keep the fuel pressure at 56 PSI which will cause the fuel injectors to stop working.
Thank you or using fixya and good luck.

May 10, 2010 | 1998 Oldsmobile Bravada

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My 2000 lincoln ls battery keeps dying have bought 2 new batteris same peoblem is something draining the power?

Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.

Jan 05, 2010 | 2000 Lincoln LS

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