Question about Ford Ranger

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Changed out alternator and still has a problems charging

After replacing the alternator,my gage still is reading a low amp

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  • Ford Master
  • 5,256 Answers

One way to be sure the gauge is right is to put a voltmeter on the battery with engine running. If the voltmeter reads under 13 volts, alternator is not working. Voltmeter should read 13.5 volts up to about 14.5, in that range. If the alternator is not working, check for a blown alternator fuse in the power distribution box, and recheck alt. and batt. connections. A loose connection anywhere there will prevent alternator from working.

Posted on Dec 06, 2012

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

bbtoast
  • 319 Answers

SOURCE: Charging system

I had this car about 10 years ago. Loved it!

You must either clean or replace the battery cable. The corrosion is not allowing the charge to get to the battery.

Many parts houses carry a battery post/terminal cleaner that will aid in getting all of the crud away from the terminal.

You should be sure to remove all of the corrosion!

Good luck

Brian

Posted on Sep 06, 2008

mcgyver468
  • 710 Answers

SOURCE: alternator is not charging after installing new brushes

COULD BE THE VOLTAGE REGULATOR INSIDE THE ALTERNATOR. CHECK IT OUT. GOOD LUCK.

Posted on May 03, 2009

edwardjwoods
  • 372 Answers

SOURCE: TCS ABS lights on & alternator not fully charging

Alt shoud be putting out 14 to 15.2 volts.

Posted on Jul 25, 2009

BLAZZ81
  • 281 Answers

SOURCE: why would my battery not be charging

find out if the voltage regulator is built in the alternator,

if not find it and test it.

If it is, it could be bad plugs for the alternator or bad wiring in the charging circut

Posted on Mar 12, 2010

SOURCE: 2003 Lincoln Towncar 130 amp alternator.Red

Check the voltage regulator and check for any loose grounds or connections.

Posted on Dec 30, 2010

Testimonial: "Thanks for your help. Any idea where the ground wire for the alt might be located.Any way to check the 3 wires that insert into the rectifier"

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If the battery voltage is low it will set codes that are not prudent. It is not a good idea to charge a dead battery with the alternator as it causes the alternator to run at high amperage.Charge the battery, clear codes and retry

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Is the alternator putting out a charging current when running? Measured at alternator then at battery. If no at alternator, replace alternator if high mileage, if low mileage replace regulator. The part the harness plugs into.

If yes at alternator and no at battery, check for continuity across ammeter and check the voltmeter for a short. The ammeter should read essentially zero ohms and the voltmeter should read about 15,000 to 40,000 ohms when measured with an analog ohm meter.

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You are looking at a charging status and not battery level. A low reading tells you that your alternator is not charging your battery. Suggest you take it to an auto parts store and have them check the output of your alternator, to check my diagnosis.

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Amp meter in truck says 12 amps when truck is running. Brand new alternator and brand new battery. Charge reads 13.5 when on hand heldmeter at O'riely but in truck it says low. cable from pos. bat. ...


It is not unusual for the cluster gauge to be off a little or out of calibration, specially on older vehicles. You could have a voltage drop at the starter, corrision, bad wires or bad connection would cause it.
The 13.5vdc at the battery is a bare minimum though and could be a potential problem. With all your lights on and blower motor on high it could even be discharging.
I would check all your cables, and look closely at the grounds. Grounds to engine and frame. Also inspect the cables, lot of times when they corrode on the ends, the corrision will continue down the cable, like a cancer eating away, you can't see it because of the insulation...but it happens.
Good luck, i hope this helps.

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ALL OF THE FUSES NEED TO BE CHECKED WITH A FUSE TESTER. THERE ARE FUSES UNDER THE HOOD & INSIDE THE VEHICLE. ALSO, WITH THE MOTOR RUNNING AT A HIGH IDLE, PUT A VOLTMETER ON THE BATTERY. IT SHOULD READ BETWEEN 13.80 & 14.90 VOLTS. IF IT READS LOWER THAN 13.0 IT IS NOT CHARGING. IF IT READS TOO LOW MEASURE THE VOLTAGE AT THE ALTERNATOR WITH THE MOTOR RUNNING. IF IT READS TOO HIGH THE ALTERNATOR IS CHARGING BUT THE VOLTAGE IS NOT GETTING TO THE BATTERY. YOU MAY HAVE TO REPLACE THE WIRE BETWEEN THE ALTERNATOR & THE BATTERY.

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My battery light came on and it seemed the gage went to low,I changed out the battery and the light is still on and the gage is still low


It isnt the battery, Its your alternator.

this is what charges your battery, it may just need to have its brushes changed , regulator / rectifier or may need replacing. If your alternator has a fuse (*some vehicles do, some have external regulators) you may just need to change that fuse.

Currently your vehicle in undercharging. Get it repaired as soon as possible.

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