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1998 Ford Explorer Low Battery/Voltage Reading

Installed new battery and alternator test good on bench3 times but voltage needle/battery indicator is low. Test voltage at battery while idle voltage reading was 7.5-12.5V. What else can cause this to happen? I want to try something else before plucking down $140 for new alternator. Truck cranks and runs good and all system works but I am worried about the gauge reading.

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  • Ford Master
  • 2,620 Answers

Bad alternator you should have about 14.7 volts at idle with a new alternator.

Posted on Nov 03, 2012

Testimonial: "It was a bad alternator. Thanks "

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Posted on Jan 02, 2017

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Mustgo
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SOURCE: battery test proper voltage, new alternator test

Battery by itself with no cable attach should read 12.4V for low and 13.6V for fully charged.

With both terminal connected a health charging system should read 13.6 to 13.8V

Amp gauge should read positive when chagring and when discharging it should be on the left (negitive side)

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Troubleshooting

Key has to be out of the ign.

Charge battery to the max with terminals off the car.

Test voltage and make sure it's between 12.8 to 13.6V

Check the battery CCA and compare it with a battery load tester.
CCA that read 60% below the sticker is a BAD battery.

Cannect the + terminal.

Carefully touch the negitive terminal to the neg. battery post.

Make sure all doors and light are off

You should get a little spark.

A large spare is equal to a large load.

An amp meter will give you a better idea what the drain is.

A short is hard to find and it will take time.

Work on one fuse at a time until you find the load.

Posted on Jul 17, 2009

dennymulford
  • 1055 Answers

SOURCE: 93 chevy suburban: started out

you have a bare wire leading form the alt too the field prob right at the intake manifold!!

Posted on Aug 11, 2010

muntejaya
  • 10421 Answers

SOURCE: i have a chevy 1995

Hi,
Looks like you have current leaks somewhere in your truck. Please go check the current leaks using AMMETER / OHMMETER to check how bad the current leak is. Check the positive pole (+) of suspected wires to your OHMMETER while another one to Body ( - pole). If the reading almost 0 ( while you don't use the power in particular wires), this tell there is short circuited of electricity. The problem is may in some relays that the power connected to the truck while not in use.
In other words , you to check where the current leaks located , so you can fix the problem from the root.

Regards, Jay

Posted on Dec 25, 2010

  • 228 Answers

SOURCE: battery tested dead, bought new

Yes. You may check the fuse frist but usally the alternator when it goes it goes and that is it. There is one fuse for that and it should be under the hood of the car. if that is good insatll a new alternator.

Posted on Jul 11, 2011

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