Question about 1997 Ford Expedition

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Battery is draining

For some reason my battery is draining once my suv sits over approx. one hour it's holding a charge. checked battery and voltage regulator and they were fine

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  • 231 Answers

Have your stater solonoid checked out it may be shorting out inside

Posted on Oct 10, 2008

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I have a iszuzu wizard or rodeo. I have changed the battery and the alternator. The new battery still drain down. The alternator is also putting out low voltage, 12.9.


have the regulator checked as the required voltage is 14.5-14.8 volts dc
check for drive belt condition and tension
with a voltage of 12 volts and insufficient charge the battery will drain down as more is going out than being provided by the alternator
besides that if the regulator is faulty it may be a reason for draining the battery

Jan 20, 2016 | Cars & Trucks

2 Answers

The battery doesn't charge


the only possible reasons for this are, in order, a bad battery that will not accept a charge, bad alternator, bad connection or a problem with the engine computer module (rare)-check to see if the battery has 12.5 volts after sitting for a few hours, if it does, start it up and see if it reads about 14.3 volts after it has been idling for a few minutes-if the battery is less than 12.5 after sitting for hours, charge it up and have it load tested (free at most commercial auto stores). If it is good, see if your alternator is producing 14.3-replace it if bad... If both check out, clean all connections from the battery and alternator, and consider the possiblilty you have a drain on the electrical system that is causing your problems.

Jun 10, 2011 | Dodge Ram 250 Cars & Trucks

1 Answer

I changed the battery yesterday and started the truck twice. The 3rd time there was no juice to turn it over. Regulator or alternator?


usually regulator. Charge battery for a few hours. Start engine and see if the voltage is 14 1/2 approx. That would mean system is charging and it's a bad battery

May 22, 2011 | 1985 Ford F150

2 Answers

97 checvy astro 4.3 6cyl. I replaced battery, Starter and the batt wont hold a charge. Is it possible to check the wiring from the alt to the starter without having to remove the alternator?


Yes, If you have a volt meter, jump and start engine, with engine running you should have approx 13.5 to 14.2volts that would tell me that batt is getting charged when engine is running. you said new batt would not hold a charge, I would be thinking about a parasitic draw(small amount of power) that in time will drain batt. things to look for are glove box lights, under hood lights that dont turn off. one easy way too see if you have a draw is to disconnect one batt cable, now use a regular (12volt non-self powered) test light and touch one end to batt cable and the other to empty batt terminal, with no light switches on and doors closed, this test light should not light and if it does then you have a drain on batt that will kill it say overnight.

Feb 12, 2011 | Chevrolet Astro Cars & Trucks

1 Answer

My 2002 audi s4 wont start after it sits for about 3 hours. I just replaced the battery. But when I jump start, it starts up.


Might be anything, but before going further I wish to check and clear three most common factors:
There are 3 most common reasons for the battery to drain.
You have to check these one by one.
A bad charging system.
Start the engine, and with a mulltimetr, or Volt/ Ohm meter, set at 20V DC, measure the voltage between terminal (+) at the battery, and a good ground. The reading should be 13.8 V to 14.2 V. If this is O.K then you have to check the battery.
Stop the engine and check the voltage between the (+) and (-) terminals of the battery. If the voltage is 12.6Volts than the battery is fully charged. If it is 12.45Volts the battery is 75% charged and so on. A bad battery is not able to hold the charge anymore, and need to be replaced with a new one.
The third reason is a phantom voltage leak.
This is a parasitc electrical drain on the battery, because a relay is sticking, a module is not shutting down, or there is a shorted diode in the alternator. To check this you need a bulb 12V 1 Amp, connected with two wires and two alligator clips. Disconect the harness from the positive terminal of the battery, and connect the bulb in serial, with positive terminal of the battery, and with positive harness of the car. Make sure to create solid contacts with aligator clips. The car electrical system hates sparks, which you have to avoid. As soon as you connect the bulb, the system might sink up to one Amper of electricity. This happen because the modules and computer starts learning, but soon the courent will decrease in milliamps. If not then you have parasitic electrical drain on the battery.

Oct 18, 2010 | 2002 Audi S4

1 Answer

Battery wont hold charge. we put in a new battery. now they say alternator is bad. could it just be a bad voltage regulator. 2001 audi s4.


Check voltage when eng. not running and check voltage when eng. running.
when switched on but not running should be approx 12VDC. when running should be closer to 13.8VDC.
If you get this then alternator is OK.
Other possibilities are battery bad. or a load on system while off.

Mar 20, 2010 | 2001 Audi S4

2 Answers

Low battery voltage light battery won't hold charge 2002 S60


Yup, time for a new alternator. Most models have the regulator built into the alternator, so it makes it a little bit more expensive - but it will resolve your problems. If you are driving at night with a load on your charging system (lights and radio on), you will probably notice you have dim headlights. If you don't change it soon, you'll end up having to replace your battery too.

Jul 19, 2009 | 2002 Volvo S60

2 Answers

Battery keeps needing a jump


If it shows the charge fluctuating alot, it's most likely the battery.

Jun 07, 2009 | 2003 GMC Envoy

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