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2000 FORD F250 HAS A MASSIVE VOLTAGE DRAW

NEW BATTERY AND ALTERNATOR. START TRUCK AND WITHIN 2 MINUTES IT DRAWS THE VOLTAGE DOWN TO BELOW 10 VOLTS AND ENGINE DIES

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  • Cars & Trucks Master
  • 21,873 Answers

Are you sure the alternator is charging the battery ?
Have you checked voltage output at the alternator with the engine running ?

Posted on Apr 21, 2013

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Posted on Jan 02, 2017

  • 30 Answers

SOURCE: electrical

If you have a volt meter check to see if there is a drain on the battery when the car is off, you can then pull each fuse to see which circuit is causing the draining. Sounds easy, but I have also seen cases where somone left change (a penny) in the cigarette lighter causing a short cirucit.

Posted on Dec 27, 2008

dlongav
  • 98 Answers

SOURCE: Battery dies while sitting idle

Well it could be possible that you have a cell that is going bad.. This would cause battery to fade with little draw from onboard accessories (ie: clock, etc...) Why not spend a couple dollars and install battery isolation switch you can flip when vehicle is expected to sit for a duration... I know this doesnt solve the drain problem you have but could be a solution for not having to jumpstart it when you need to ude it..Good Luck

Posted on Dec 30, 2008

bump425c
  • 16 Answers

SOURCE: 1984 Ford F250 5.8L 2

This is not rare. Possibly bad "new" alternator or bad "new" regulator. Have seen it happen many times. :-)

Posted on Jan 07, 2009

  • 1 Answer

SOURCE: When accelerating alternator light comes on.

Possible loose or worn alternator belt. Check the condition of the belt. If it's worn, replace it. If it's just loose, tighten it up.

Posted on Jan 24, 2009

  • 14 Answers

SOURCE: 1989 Ford F250 7.3L Diesel. Bat light came on then smoked the VR

your alt and breaks are belt driven check your belts

Posted on Nov 20, 2009

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Im having a problem not getting enough voltage running through the truck put a brand new alternator on and when my truck attles my headlights go dim nd it shuts off


Have a load test done on the battery to check for cell failure as the alternator may be putting all the current into a shorting battery. Check the output of the alternator as the regulator may be faulty. Alternators produce 14.5 volts at 2000 rpm and the current is set according to requirement. That is with 14.5 volts and full current draw the alternator is capable of producing the rated amps ( up to 120 amps) If you have extra power requirements ( driving lights --massive amplifier) the total current draw may be more than the rated amp of the alternator and so the battery will eventually run down and there will be insufficient power to run the ECM and it will stop.

Nov 11, 2014 | 1984 Ford Ranger

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Voltage draw down found!
1) repaced bad battery
2) rechecked voltage draw...


Voltage draw down found!
1) repaced bad battery
2) rechecked voltage draw still showing 12 volt drain with all under hood fuses, relays, and interior fuses and relays pulled.
3) Computer was the 12 Volt drain, & had to reprogram itself.
4) gave the new battery a good long charge, reinstalled the battery into the vehicle.
5) Hooked the battery up, pulled the keys out of the ignition, close and lock all doors with auto door lock. Waited minimum of 20 min so the computer would go back into the sleep mode.
6) after 20 minute wait, rechecked the voltage draw by removing the neg battery cable from the battery, hooking volt meter + lead to battery cable end, and neg lead to battery neg post, nothing showing or zero reading.
7) Hooked the neg cable up to battery, started the truck and let the engine idle to normal run temp, then fast idled 1200-1300 rpms for 2 minutes, then drove the vehicle for 5+ miles and alternating speeds. All appears back to normal now. Alt showing 14.2 to 14.4 volts, and no other problems.
After all of the afore mentioned, my problems began with a bad battery cell, thus caused my computer to have the memory reset.Until the computer was reset, I had a 12v continious draw down! I got this info from a repair manual, that I purchase sometime ago. Thanks for your alls help........EJB

on Dec 30, 2011 | 1996 GMC Yukon

1 Answer

Battery drain on a 1973 ford f250


with a charged battery remove the negative cable place a test light between the cable and the battery if the light is on there is a draw unplug one thing at a time a bad diode inside the alternator will also cause a draw then pull out the fuses one at a time

Oct 09, 2012 | Cars & Trucks

1 Answer

Why do the lights flicker when trying to turn over the engine?


The battery is low on charge. Either the battery is failing or your alternator is not putting out enough charge or the starter motor is drawing too much electricity. If you have a volt ohm meter you can check the all of these conditions. Simply by connecting the VOM to the battery. Your battery should have a static charge of about 12.5 volts. When you try to start the engine the voltage on the meter should not drop below 10 volts..If you have the engine running the voltage should come up to about 14.4 volts within 2 minutes. If it doesn't come above 14 volts there is a problem with your alternator.

Dec 04, 2011 | 2006 Acura MDX

2 Answers

New battery keeps going dead.i exchanged later it went dead had alternator checked and it is ok


WEll, something is causing the issue.... First, fully charge the battery, then disconnect the negative and put a volt meter or test light in series (between the terminal and the cable). Disable interior lights, and test for draw of current.
Essentially, if the light lights, too much current is being drawn out of the battery. So, you disconnect fuses, and other items until the light goes out. This should help you find the offending component.

IF no light lighting, perhaps the battery itself has issues. Leave it disconnected overnight, and see if it is discharged...If yes, the battery would be suspect.

There are diodes in the alternator that fail and can cause voltage to be drained. Some tests to the alternator fail to reveal the fault. the best test is an Scope, but you can isolate diodes and test with continuity tester.

Feb 04, 2011 | 1999 Ford Escort

1 Answer

I have replaced the battery started the car once and now the battery is dead. How do i check the alternator without taking it out of the car.


You can't check an alternator without running the car. I'd check for excessive system draw though by putting an ammeter between either of the battery cables and the battery and pulling fuses till draw diminishes substantially. then, track down the components served by that fuse. Your alternator can also draw if there is an internal problem usually with the bridge rectifier which short of a rebuild, can't be fixed (alt needs to be replaced) But I would not go there 'till everything else was tested.
On the other hand, if you started the car once and immediately (within minutes) the car did not start (engine not turning) I'd look closely at all battery connections, ground points, relays and starter itself. To knock a new battery down that fast would require a massive short circuit or a system disconnect somewhere. I'd also make sure the battery has 12volts in it and can withstand a load test. even a new battery can be defective....not often, but it can happen. Also make sure if you have a security system it has not engaged and isn't just doing it';s job.

May 14, 2010 | Cars & Trucks

2 Answers

Battery is new. I turn the key and nothing comes on. I can jump it off and an hour later it wont start again


take the battery in to have it tested it may be defective. if the battery tests ok your alternator isn't charging. if you have a volt meter , your battery voltage should be no lower than 12.5 volts dc and with the motor running you should see no lower than 13.5 volts dc with everything turned on (lights, ac on fan on high) if the voltage drops below that your alternator is bad.

Jan 28, 2010 | 1990 Lincoln Town Car

2 Answers

My 2000 lincoln ls battery keeps dying have bought 2 new batteris same peoblem is something draining the power?


Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.

Jan 05, 2010 | 2000 Lincoln LS

1 Answer

On 1973 Ford LTD the battery runs down while


dear friend-the voltage that you are measuring is battery voltage and as soon as you try to start the vehicle it will drop to 9 volt which is not enought to start.if you remove the pos,battery clamp and put a test light between the pole and the terminal and and the light lites up then there is a draw running the battery flat.

Nov 09, 2009 | 1982 Ford Ltd

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