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How do I know if it's my voltage regulator or the alternator on my 1999 Suzuki tl1000 the battery won't stay charged?

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  • 43 Answers

Easy.
with a voltmeter.
13.3v to 15vdc running, RPM over 800 on engine,
if not ask why. now.

Posted on Apr 11, 2015

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Posted on Jan 02, 2017

  • 958 Answers

SOURCE: Alternator or Voltage regulator

if you can carefully put a metal wrench on the rotating pulley of the alternator and felt a magnetism attracting the metal wrench, then your alternator is charging. if there is no magnetism, then the alternator is not charging...

another test is to measure the voltage on the small wires that went in to the alternator that says "F" for field, it should measure battery voltage...that is the voltage from the regulator..that means your regulator is working...but the altrntor is not..

without that battery voltage, then the regulator is he culprit...



pls be carefull...

hope i was able to solve ur problem..

pls rate me.. tnx, drcool..

Posted on Jul 26, 2008

samson-1
  • 153 Answers

SOURCE: alternator light on

The alternator is not producing any power . If it were the engine would run without the battery. Check the wiring on the alternator. It must ave an exciter wire to make it work.

Posted on Oct 07, 2008

  • 1779 Answers

SOURCE: Location of the Voltage Regulator

The source I checked says it's located under the hood, driver side, rear engine area on firewall (V-8 engines) Let me know how u make out.

Posted on Dec 18, 2008

  • 155 Answers

SOURCE: 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.

Posted on Jun 08, 2009

  • 198 Answers

SOURCE: I have a 2001 Honda

Bad alternator/voltage regulator or your car may have a body ground sensor, it will need to be checked with a computer to get this one diagnosed properly. Headlight switch may be the problem itself, lots of moving components in them now days.

Posted on Oct 06, 2010

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2 Answers

SUZUKI JIMNY 2004 MODEL. ALTERNATOR NOT CHRGING THE BATTERY. HAVE JUST CHANGED THE FAN BELT


take the vehicle to an accredited auto electrician to have the alternator/ regulator tested
could be brushes or faulty rectifier or problem voltage regulator

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voltage regulator. it may be in the alternator, or remote mounted. ((the alternator can be charging, but if voltage regulator is'nt working then it won't allow voltage to get back to the battery to keep it charged

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I have a 2000 Dodge Caravan battery won't stay charged


You might have a bad alternator. Take your battery in to have it tested and if it is good then it is probably you alternator. Good luck

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1 Answer

I have an 86 toyota pcickup battery charge light is on have good battery and replaced alternator twice.


i think you have an external voltage regulator in that year , ck that first . The easy way to tell if it has an external regulator ,if it has carburated it has an external regulator if its fuel-injected its internal regulator in side the alternator.Have you checked to see how much voltage the charging system is putting out at an idle ? It should be around 13.5 volts to 14.5 volts any less then 12.5 charge light won't go out.

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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...


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Your alternator is on the way out,replace with new or rebuilt. you can remove alternator and have it bench tested to be sure.

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My 7.3 L diesel ford f-250 shows the battery light (check charge system) on in the dash. I tried to drive it and the voltage gauge started dropping into the 10-11 v range. I replaced the alternator...


You must have an older vehicle,but I am pretty sure the 7.3 was put out after the voltage regulator was put in the alternator.What you are describing is a voltage regulator on the the firewall.If this is so,replace the voltage regulator on the firewall,with a new one.This will be the problem most likely.The voltage regulator on the firewall should be kind of flat,almost square,and a wide plug,goes all the way across the voltage regulator.If You don`t have external regulator,then it is built in the alternator,and the alternator you purchased is bad.Be sure the wires on the back of the alternator are not broken anywhere.The big post ,largest wire,on the back of the alternator is the out put wire.It should go to the battery.If it does not have 13.65 to 14.25 volts on the back of the alternator,and at the battery positive post.Like I said,I believe the voltage regulator is on the firewall,if it looks like I described,then it is a regulator,replace this part(voltage regulator)and it will solve your problem.I hope this was some help,please let us know,thank you.

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1 Answer

1999 Mercury Sable Battery indicator stays lit changed the battery with a fresh one, the indicator stays lit.


Have your alternator checked. Start the vehicle and disconnect the Negative battery cable. If the vehicle dies the alternator is bad or you have a bad voltage regulator.

Sep 08, 2009 | 1999 Mercury Sable

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