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Battery won't hold a charge, battery and alternator both check good. Where is the voltage regulator at on these vans?

Battery won't hold a charge, batt and alternator both check good.

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  • Cars & Trucks Master
  • 2,474 Answers

Hey Rick ,I don't know what you have so it makes it harder to help you ,I don't dough you checked battery and alt . unless you have a dead short the battery should hold a charge , as far as the alt. most have an internal built in regulator , start the vehicle when its running disconnect the battery if it dies its the alt .

Posted on Nov 08, 2014

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Posted on Jan 02, 2017

  • 114 Answers

SOURCE: 1996 dodge ram 2500 van alternator not charging battery

do a continuity test from the large red wire on your alt to the battery,could be a fusible link or broken wire,sometimes a wire will break within the sheathing so it won't be visible by eye,check all conections for corrosion and either clean or repair

Posted on Feb 21, 2009

csmock132
  • 4669 Answers

SOURCE: Battery dosn't charge, alternator/voltage adapter test's good.

Did you test the Alternator on or off the truck? It might be a problem with the control system to the Alternator. The regulator need a battery feed to work, It is usually ran through an alternator fuse.

Posted on Mar 11, 2009

  • 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

BlackOnyx
  • 102 Answers

SOURCE: nissan terrano 1996 td27 charging issue.

Did you hear the one about the Terrano with a charging problem?
Just fix it by replacing the thermostat!
Seriously - check your temperature gauge does it take ages for the needle to barely get off cold? (and is the heater useless?)
The needle should get to just below half way in 2 or 3 minutes.
If the thermostat is stuck open, then the engine does not get up to temperature.
The glow plug control senses the engine temperature is cold, so the glow plugs stay on for an extended period of time (sometimes 10 to 15 minutes) - short trips particularly in winter, with more headlight driving - the alternator can't keep up with the current being drawn off and from time to time you will end up with a flat battery!
A thermostat is cheap, and easy to replace (three bolts and about a half litre of coolant - I pumped the coolant from the top of the radiator, and didn't spill a drop when the thermostat housing was removed).
Sure enough, as the engine temperature reached about 50C, the glow plugs turned off.

Posted on Jul 21, 2009

SOURCE: battery not charging, alternator seem to putting

11.50 volts won't be enough potential to overcome the batteries 12 volt standing charge.

Either your alternator is shot...which you can check by going to an Autozone and having a free system check. Or your battery is already going bad and not sending enough voltage to the alternator to make the 13.8-15.8 volts it should be making.

If the alternator is the culprit a good mechanic will swap it out for a fairly low price and save you a lot of headaches.

Good luck and be careful.

Posted on Jan 14, 2010

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that would be correct
an alternator requires a battery voltage to energize the fields to generate a current a dead flat battery or no battery and the alternator will not charge
it probably would keep running if the rpms were high enough for the voltage regulator to supply the voltage
be aware that it is a very good way to ruin an alternator and regulator to take off a battery lead while it is running

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