Question about 2006 Datsun 210

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Hello i have a 1978 280z change the alternator still not charging lookin for the voltage regulator cannot findit

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Put a gm internal regulated one in. just flip upside down and drill out hole for long bolt.

Posted on Mar 03, 2015

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Should be on One SIDE Under Hood or Firewall A BLACK or SILVER BOX with Approx 4-6 Wires on It's PLUG

Posted on Oct 04, 2009

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2000 Chrysler t&c,what causes the battery to drain instead of charging,only when the van is running.


If the battery is draining while the engine is running, I would suspect the alternator is not working properly.

Apr 11, 2015 | 2000 Chrysler Town & Country

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

84 dodge ram battery wont charge


If it has a voltage regulator it should get power from the key switch to the field wire on the regulator.
You should have battery voltage at the big wire on the alternator with the key off.
I would check for a fuseable link between the alternator and the battery first.

Jul 21, 2012 | 1984 Dodge Ramcharger

1 Answer

1998 Chrylser Sebring Voltage regulator


All I can tell you is that when the regulators in the PCM mess up, the alternator usually will not charge at all.

I do not know what you mean by "all over the place", but I can also tell you that if your charging system voltage is really erratic, like 12 volts one minute and nearly 15 volts the next, it is usually caused by a shorted (oe sulfated) battery cell. A shorted cell will cause the alternator to "full field" and make the whining noise you are describing. Also, shorted battery cells are what usually causes the early death of many alternators.

Jan 04, 2012 | 1998 Chrysler Sebring

1 Answer

Battery is not charging. Test of electrical system seems to show a problem with voltage regulator. Where is it located?


Hello pkbanta: My name is Roger and I will help with your answer. The voltage regulator is located on the back of the alternator. You must remove the alternator in order to replace the regulator. I would have the alternator tested before just replacing the voltage regulator. If the brushes are bad you could receive the same reading of a bad regulator. Should you need further help please just ask. Please rate the answer. Thank You for using Fox Ya. Roger

Jun 24, 2011 | 1998 Ford Windstar

2 Answers

Hello my name is Christina I have a 2005 Ford Explorer and my check charging system light keeps on coming up. I changed the alternator 2 to 3 times already I have had the car for about one year and half....


It seems like there is most likely a bad connection between your alternator and your battery I would look into replacing those wires. That is far more likely than that many bad alternators.

Oct 05, 2010 | Ford Explorer Cars & Trucks

1 Answer

Hello, I have a 1995 Buick Riviera w/3.8 ltr supercharged VIN 1. I replaced the old alternator for being noisy-bearing worn. I went to Autozone and got a replacement alternator. the alternator is not...


Use a jumper to connect the positive terminal of the battery to the terminal L input of the alternator. That will give 12V to the exciter circuit of the voltage regulator and turn on the alternator so that it can begin charging. If that makes a difference, there must be something wrong with the input to terminal L.

Oct 04, 2010 | 1997 Buick Riviera

1 Answer

1999 Isuzu Rodeo blinking lights


low voltage pulling by what your saying it sounds like your alternator is about to give up seeing that it cant disperse elec. to other units so its draining off the battery

change out the voltage regulator they didnt change your alternator they just rebuilt it or did nothing it sounds like

voltage regulator = adjusts the voltage
some are built on the alternator and is replaced at once with new alternator
others look like a little fin like an amp usually black in color this you will see bolted on the fender right or left this is a voltage regulator

somtimes you get a bad alternator in box when it can be new this is a chance chance cause now most parts are remand.
i still believe its your alternator you either of several things
got ripped off
got a bad alternator in replacement or
you got a bad voltage regulator by itself
looks like this
d5b255e.jpg

Dec 06, 2008 | 1999 Isuzu Rodeo

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