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Have changed out the Alternator and battery with new ones. Battery will still not stay charged. Thought it may be a Voltage Regulator issue is that the only other thing it could be?

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MAKE SURE YOUR BATTERY CABLES ARE CLEAN AND TIGHT.MAKE SURE YOU ARE GETTING GOOD GROUND AT NEGATIVE BATTERY CABLE.IF BATTERY CABLES VERY OLD REPLACE THEM.IF ALL IS GOOD ALTERNATOR HAS LOOSE B+ WIRE AND FIELD WIRES CONNECTIONS MAKE SURE NONE OF WIRES DAMAGED AND ALTERNATOR DRIVE BELT NOT LOOSE SLIPPING.IF ALL GOOD YOUR ALTERNATOR HAS THE WRONG AMP AMPS TOO LOW HAVE WRONG ALTERNATOR. OR YOU HAVE FAULTY ALTERNATOR.

Posted on Aug 22, 2010

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Have an 07 f350 Ford pick up 6.0L power stroke .batterys replaced . Alternator replaced . Dash battery light still stays on no charge .soure voltage gd to alternator ,and plug . Reads gd voltage to si


I would try the regulator, there is a few tests to see if the alternator is charging, use a multi meter and check the b post on the alternator and earth and see what voltage it is producing, check all those sort of things and you will find the problem, make sure the battery terminals are very clean or they won't accept charge as well, hope this helps

Dec 28, 2014 | Ford Cars & Trucks

1 Answer

2003 bmw x5 4.4 battery light stays on


Brother Mark, changing the battery with a new one being done won't make the light go out, as you noticed. Light is still on so you changed the alternator. Good, but the battery light is STILL on. This only means that the charging circuit from the alternator is not working in the voltage regulator or the wiring is not connected properly to the alternator/regulator. A new battery will show over 13 to 13.5 volts not connected. An old battery will still show 12 volts and still be weak or bad. After connected and engine running, the system will show at least 14 volts because alternator/regulator is working properly, using a voltmeter/load tester connected to the battery. If after replacing the battery and alternator it is still reading 12 to 13.5 volts, it is not working and the light will stay lit on the dash. You may have purchased a faulty alternator if the system tests out this way. Have your system checked with a volt meter or load tester bit be sure all the connections are proper and clean.

Mar 26, 2014 | BMW X5 Cars & Trucks

1 Answer

Battery good, alternator good, starter good but my 1966 oldsmobile the alternator isn't charging the battery


Have you replaced the voltage regulator?
Unless you have changed the charging system and eliminated it, the alternator does not have a built-in voltage regulator like the newer ones do.
Be blessed.

Feb 06, 2013 | Cars & Trucks

1 Answer

2nd newly rebuilt alternator burning out.


Due to the nature of the battery technology used with vehicles the alternator is mostly incapable of charging the battery. The car alternator is designed to keep a fully charged battery fully charged and to provide all the power for the car equipment.

The alternator charge rate is regulated by a voltage regulator. Because the alternator output is connected to the battery, the alternator and battery voltage will be the same and the voltage regulator monitors that voltage.

The lower the battery voltage the more output the alternator will produce in order to correct the situation but because a lead acid battery has a high internal resistance to accepting a charge the terminal voltage will quickly rise to the alternator regulated voltage and fool the alternator into thinking the battery is fully charged when the output will drop to the order of just a couple of amps.

Switch on the headlights or a similar load that will lower the battery voltage and the alternator will increase it's output again - but only by the amount of current the headlamps or other load is consuming.
It matters not what the alternator rated maximum output is, it is designed to provide only the necessary current and no more.

The only time an alternator should ever need to produce maximum output is when on a dedicated testbed and then only for a short duration to avoid damaging the unit. Testing the current output on a modern vehicle is not recommended except for the regulated voltage testing and a rule-of-thumb output test where all equipment is switched on and the engine speed raised while the battery voltage is monitored.

Most modern alternators use an internal voltage regulator but a few systems use a separate voltage regulator. No alternator rebuild would be complete without a regulator test and probably a new or replacement regulator, which is where the majority of charging system problems are, or the brush gear.
Assuming the wiring is ok, no alternator should suffer any harm if the voltage regulator and auxilliary diodes (if fitted) are in good order though fitting a defective or a discharged battery can cause it to overheat and be damaged.

The alternator usually just about stops producing an output when the battery voltage is in the region of 14.5/14.8 volts.
Your description indicates the voltage regulator is not working correctly - unless 40 amps was being consumed by the car equipment the alternator should not have been producing 40 amps.. I suggest you also have your battery tested

May 12, 2017 | 1988 Acura Legend

1 Answer

I seem to have a charging of the battery problem. I would get 14 volts to my battery from my alternator and then 6 volts, i changed m alternator and things were going great, no problems. Now it is acting...


Hi,
If you were originally having a wild fluctuation in measurement at the battery the voltage regulator would have been shot. I'm not sure of what the condition was of the original alternator. But I would definitely have changed the voltage regulator. A bad regulator can ruin a battery and all sorts of other things. If you are now getting wild variations in voltage
1st Purchase and install a new voltage regulator. (probably about $20.00 these days.
Then check your new battery by doing the following:
1 Disconnect it from the truck's electrical system.
2 Charge it up using another vehicle and jumpers.
3 After disconnecting the battery from the jumpers, let it sit for a few minutes.
4 Check the voltage. If it is below 12 volts, the battery is shot. Replace it under warranty.
5 When you get the new battery, Install it in the truck and start it up. Then measure the voltages coming into the battery from the alternator and the new voltage regulator.
If all is well, your done.
If not. Pull the alternator and replace that.
Hope this helps,
Good Luck,
Mark

Jan 05, 2011 | 1988 Dodge Ram 50

2 Answers

Can not solve Battery charging fault on my Xzara Picasso.? The battery on my Xzara went flat and " Battery Charging Fault" message came up and the battery charging light stayed on.. The garage...


If the regulator in the alternator has no feedback from the battery voltage, it will overcharge the battery OR the alternator is faulty. If the alternator is spun and a 12volt current source is put on the field terminal, it should produce 14.5Volts and no more without anything else to control it. I reckon the alternator is faulty.

Mar 18, 2017 | 1986 Chevrolet Cavalier 2 Door

1 Answer

I am trying to locate the alternator and voltage regulator in my 1985 jaguar xj6 there was an electrical problem and some on the wires melted down in the dash board we replacedd the wires and got a new...


FOLLOW ALTERNATOR WIRES AND BATTERY POSITIVE FEED WIRE.IT WILL TAKE YOU TO THE VOLTAGE REGULATOR BOX.CHECK ALTERNATOR FUSE.IF YOU HAD WIRES TO BURN AND MELT.MORE LIKELY YOU HAVE A BLOWED FUSE.

Sep 17, 2010 | 1985 Jaguar XJ6

2 Answers

Honda civic 2001, excessively high voltage 19 to 20 volts ... so something is wrong. Before replacing alt& regulator, what voltage and under what conditions should be on each of the 4 control wires...


never mind testing if when you start the car you are getting them voltages then fit a new alternator and quick before you burn out the ECU ,the regulator has packed up end of story ,change alternator now ,NEW not a scrappy one from scrapyard,and stop try to confuse the issue with something you do not know ,no voltage leaving the alternator should not exceed 14.7v

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1 Answer

Battery will not stay charged


Check the battery strength and then double check your alternator to make sure it's charging.. I installed 3 alternators, new off the shelf, on one vehicle, and all three were duds (4th one worked fine). If the battery does not need replacing, and the alternator is charging, double check and make sure no components are left on such as a light in the glove box.

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1 Answer

Battery not keeping charge after alternator changed out..


If you have a voltage regulator than yes this could very well be the problem however I dont think your truck has one. Normally when this thing happens you check the diode in the alternator but you said you replaced the alternator so well assume that is not the problem. Next with the engine off and all electrical acc off. Loosen the positive cable on your battery take the cable off and watch for a spark between the cable and the battery, if there is a spark that means you have juice being drawn from your battery look for a short in your wiring.

Mar 26, 2009 | 2002 Ford F150 Regular Cab

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