Question about 1993 Ford Ranger SuperCab

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1993 ranger charging problems

The regulator is internal. It was replaced as a unit with the alternator. I also had the new alternator tested and it checked out good.

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  • 2L8IW1N Jul 07, 2008

    Battery is new, it turned out to be a bad voltage regulator on the NEW alternator.

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If your alternator is good then its your battery,its probally has a lowelectrolyte level,if you take the battery to an autozone they will put a load on your battery then a charge and let you know if its good right away and its free

Posted on Jul 07, 2008

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Posted on Jan 02, 2017

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2 Answers

Ford ranger charging issue, when I rev the rpms my guage is normal, and when I let it idle normally the guage falls, is this the voltage regulator?


Possibly the regulator however most alt. Are internally regulated. Have your system load tested at an auto parts store

Oct 24, 2016 | Ford Ranger Cars & Trucks

1 Answer

What could be draining a brand new battery along with having a brand new alternator?


the alternator is not charging
problems include incorrect alternator ( internal voltage regulated as against external voltage regulated )
blown rectifier plate ( charing with ac current instead of DC)
drive belt tension
best have it checked by an accredited auto electrician

Oct 22, 2015 | Cars & Trucks

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

I have a 1993 ford ranger stand.cab w/2.3l 5spd std.charging system will not charge.I've changed battery,altonator,belt,checked all the wiring in the engine compartment everything checks out fine.still...


Hi Closet, I think the problem will be with the voltage regulator or a defective alternator. I believe it will be easier to fit a service exchange unit. That will mean removing the alternator from the vehicle. Remove the keys from the ignition. I believe its a good idea to make sketches all the way through the procedure, that way you'll know what goes where. Disconnect the battery and remove the negative. Loosen the alternator tensioner until the belt can be removed. Disconnect the electrical connections. Remove the through bolt under the alternator and then remove the top bolt. Remove the alternator from the bracket. Fitting is the reverse procedure. Make sure the belt is correctly tightened, and you should be away. Regards Johngee10

Jul 24, 2011 | 1993 Ford Ranger SuperCab

2 Answers

Hey i have a 1993 ford bronco four wheel drive with the 5.8 engine. I have had the alternator checked and its good and the battery is good but it will not charge. Its running on just the battery, Do you...


You need to check your alternator circuits. If the alternator itself tests good (I am assuming it was removed from the vehicle and taken to a parts store for testing) then the only thing left are the alternator circuits themselves. The large BLACK/ORANGE wire needs to have direct connection to the battery. This connection needs to be clean and tight with little or no resistance....This needs to be checked with an ohm-meter to verify. The rest of the circuits depend on what your vehicle is equipped with. 1993 Ford Broncos were originally equipped with two different charging systems. One had an integral regulator (regulator built into the alternator) and an external regulator. (voltage regulator mounted on the fender, separate from the alternator.) If you have the external regulator, that is what I would suspect as the cause of your problem. If you have the internal regulator, then I would check for battery voltage on the two BLACK/ORANGE wires and the YELLOW/WHITE wire at all times, and the LIGHT GREEN/RED wire should have battery voltage only with the key in the ON position.

Apr 09, 2011 | 1993 Ford Bronco

2 Answers

I have a 1993 GMC 4x4 350 suburban that keeps discharging the battery. I have replaced the alternator and still discharge the battery. I was told that it needed a voltage regulator but can not locate where...


The voltage regulator is built into the Alternator. Take out the Alternator and have it
tested at your local Auto Parts store (they all do it free). This will tell you if the Alternator
is your problem or if you need to check elsewhere.

Mar 26, 2011 | 1993 GMC Suburban

1 Answer

1993 Ford Ranger charging system problems


in order to answer your question i need to know if you have internal or external regulator for alternator

Jun 02, 2008 | 1993 Ford Ranger SuperCab

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