Question about 1990 Volvo 240

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1990 240 dl Volvo wagon, have to put fully charged battery, then when the battery is discharges the car dies, alternator ? Voltage regulator ?

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Sounds as though you have a bad alternator or a loose alternator belt and the battery is not being charged. while the car is running - check the voltage from the alternator and make sure it is about 13.4 volts DC.

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Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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I have a 05 2.7l XL7 just put a new alternator in it today was charging at 14.32 now it's charging at 12.30v I'm trying to find the relay for it to test it where is it at


the relay will not alter the charge rate but the voltage regulator will
regulators reduce the rate of charge according to the battery voltage so if the battery is fully charged at 13.2 volts it is possible that at idle speed , that voltage recorded from the alternator is correct
you can check by inducing a discharge such as turning on the head lights and ac unit and then increasing the rpms to around 2000rpms where alternators are checked

Jun 26, 2017 | Cars & Trucks

1 Answer

KUN 26 D4D Hilux...something is draining the battery over 3 or 4 days...Alternater putting in 13.85v but battery goes flat over 4-5 days


13.85 volts is barely sufficient and would indicate an alternator fault if the reading was taken "off-load"..

An alternator is not designed to charge the battery and is incapable of doing so because the terminal voltage of the battery quickly rises to fool the voltage regulator into believing even a discharged battery is fully charged and will quickly reduce the charge rate to a trickle.

The alternator is therefore designed to keep a fully charged battery fully charged by supplying all the current for the vehicle equipment and the output rating is chosen for this purpose.

The voltage regulator should limit the off-load voltage to about 14.5 volts but that is only a small part of the alternator test. A professional would apply a load across the battery equal to the rated output while monitoring the voltage and current. Most healthy alternators exceed specifications.

For a sensible in-service test when an adjustable load isn't available, with a fully-charged battery it is sufficient to start the engine, leaving it to idle and switch on all the vehicle equipment. Fit a voltmeter to the battery and wait while the battery voltage is pulled down by the load - to around 12.5 volts. Raising the engine speed to 2500/3000 rpm should cause the voltmeter to suddenly rise.
13.85 would be just about acceptable "on-load" but in excess of 14.0 volts would be ideal.

Jul 10, 2016 | Cars & Trucks

1 Answer

I have a 2003 ford focus wagon second hand. My battery died out and I thought the alternator was the problem. Brought my car to an alternator repair shop and they said the alternator is still good. I ended...


Lead acid batteries don't like being discharged flat, and it could now be damaged and unable to hold a charge. It does sound as though the voltage regulator part of the alternator is allowing discharge to ground when it should not. You would seem to have a good warranty claim on the battery given they did check the alternator and pronounce it OK.

Nov 04, 2013 | 2003 Ford Focus

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

My Sansa fuse will not start, or charge


This sounds like a bad alternator.Remove the battery and have it charged and tested, if the battery is fully charged then truck should start and run for a while.With a bad alternator the battery light will come on and truck will run until battery life is discharged.With the battery fully charged and truck running put a tester on the battery to test the alternator output. the reading should be 13.5 - 14.7volts. any reading below 13.0 replace the alternator.
Do not drive truck to far as when the battery voltage gets low truck will die out.

Apr 01, 2012 | Cars & Trucks

1 Answer

What happens when battery light keeps coming on 2003chev trailblazer


Voltage low usually alternator/regulator not working and battery is discharging. Put voltmeter on battery when running should be 13 to 14.8 volt if not replace alternator and 13 is low should be about 13.8. A fully charged battery is 12.6 not 12.5or lower

Jan 08, 2012 | 2003 Chevrolet TrailBlazer

2 Answers

Volvo wont run


it sounds like your throttle positioning sensor unplug it see what happens if nothing changes there you go.

Jul 02, 2009 | 1986 Volvo DL

1 Answer

Battery Light is On


The alternator is not charging the battery. Could be alternator, voltage regulator (which is usually in the alternator) , dirty/loose connections. First I would inspect all relevant electrical connections, clean & tighten. If no change -- replace alternator.

But be sure to fully charge the battery before you run the new alternator (follow alternator installation instructions).

May 13, 2009 | 2000 Volvo S70

1 Answer

1992 Nissan Pathfinder charging problems


How long did the 2nd alt. last before it died? The voltage regulator is, I believe, attached to the alternator. Have u had the voltage regulator checked?

Jan 04, 2009 | 1992 Nissan Pathfinder

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