Question about 2004 Aprilia Atlantic 500

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Battery doesn't charge

New voltage regulator was installed by dealer. Part# 58086r, repair manual part # is Ap8127205 was the correct voltage regulator installed?

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Why is my battery on my aprilia 50sx boiling over any ideas will be much appreciated many thanks bob

Posted on May 11, 2013

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Yes but the problem might be misdiagnosed. Keep in mind if you read your manuals, that the generator puts out 50 volts, and the regulator reduces it to 13.4-14.4 Several electricians have speculated that the problem is a bad stator. Why would it be the regulator, since that is a problem usually indicated if the voltage is too high?

Posted on Aug 23, 2012

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This is the right regulator for Atlantic 500 2004
Aprilia code - 58086R
Best regards,
PS-Don't forget to vote me, thanks!

Posted on Feb 09, 2011

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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

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2008 harley dyna high voltage

depends on the state of the battery , The regulator looks at the battery charged state and regulates the voltage to fully charge it , If the voltage does not drop back after a few hours the battery could be on the way out.

Jan 28, 2012 | 2008 Harley Davidson FXDB Dyna Street Bob

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I have a Panasonic CF_72 toughbook it is no charging the battery, I bought a new battery and have power to the mother board but it's not getting voltage to the battery to charge it. I was told there is...

This is just a suggestion, but some Dell Computers use an AC adapter which sometimes power the computer but do NOT charge the battery pack.

Simply trying another different power supply or AC Adapter will fix the problem without changing the voltage regulator.

I hope this corrects your problems.

Good Luck and regards from:
Richard, Montreal Based Panasonic Canada Toughbook Authorized Dealer since 1989.

Oct 24, 2017 | Panasonic Toughbook 72 Notebook

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You are misunderstanding the manual. There is a voltage regulator and it is part of the engine computer. When the regulator goes bad, you need to replace the computer. Its a really bad design but that's the way it is!!! There is a "work around" involving bypassing the computer and installing an external regulator but it turns the light on and won't pass inspection that way.

May 31, 2011 | 1993 Jeep Grand Cherokee

1 Answer

New alternator new battery installed still wont charge the battery and radio and power anttena dont work

If you have a voltage meter, you should check if your voltage regulator is working correctly. The voltage regulator should keep the voltage to the battery something under 15 volts when the motor is running (more than 13.5 volts with all electrical turned off).

If more than 14.5 volts, you may be damaging your new battery and regulator is not working properly. Also, radio may not come on because a voltage sensor is protecting it from the high voltage. Antenna is controlled by radio so that should not be working either.

Good luck.

May 05, 2011 | Buick Century Cars & Trucks

1 Answer

Battery will not charge, first time its ever did this. rebuilt alternator new battery and new starter not to sure if new starter has anything to do with battery chargin but replaced it anyway, has good...

A bad voltage regulator could cause the problem. Assuming the alternator is working correctly. Jump the vehicle with the battery disconnected and then disconnect the jumper cables. If the vehicle dies your voltage regulator or Alternator are bad, some vehicle have separate regulators from the alternator, if it continues to run the alternator is good but the voltage regulator is probably the cause.

Aug 08, 2010 | 1984 Oldsmobile Cutlass

1 Answer

Batteries won't charge

Hi. Sounds like there is a faulty connection somewhere between the charger and the batteries. Are the batteries connected correctly. The charger uses the voltage level in the batteries to regulate itself. If there is a faulty connection, then the charge will not operate. Use a multi-meter to check if the batteries are connected correctly. There should be 24 to 26 volts across both batteries.
This fault can also be caused by a faulty charger socket. Check for any signs of melting or heat damage. There might also be a disconnected wire in the plug on the charger itself.Good luck. Neil.

May 29, 2010 | Drive Medical BLUE 3 Wheel Compact Mini...

1 Answer

My bike charges the batteri badly. It doesn´t matter if the bike is running or if it´s on standing still. If i turn on the lights when running the charging is even worse

first of all check the voltage across the battery with the bike running,it should be between 13.2 and 14.5 volts,if it is not then there is a good chance that either your alternator or generaator need new brushes or by your description hane the voltage regulator checked or replaced,if this is not working correctly you will not charge the baateery,hope this helps

Jul 06, 2009 | 1998 Honda CBR 900 RR Fireblade

2 Answers

2004 polaris predator 500 3 new batterys dying can't charge them

I hope you got this problem fixed, just happened to my predator, it was indeed the voltage regulator. I picked up a service manual that includes part numbers and installation procedures from for 15 bucks.

Mar 21, 2009 | Polaris ATV

2 Answers

My battery is good but not getting charged on my buell

Check your conections at the batery and at the selonoid. It could also be your voltage regulator or the generator, the repair manual should tell you how to test them.

Feb 23, 2009 | 2001 Buell M2 Cyclone

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