Question about Ford F-100

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1981 Ford F100. Alternator is overcharging the battery and generally putting out WAY too much power. New alternator (twice over) and new regulator (the box on the wall inside the engine area) All the wires are intact and working as best I can tell. I checked all the terminal ends of the wiring with a 12 volt lighted handle tester.

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: ford f100

0.81 - 0.91 millimetre

Posted on Jun 08, 2008

MobyMech
  • 106 Answers

SOURCE: alternator not charging

Hi

If you have a volt meter, set it to volts and hold the negative probe to the alternator body and the positive to the battery positive. If you don't get battery voltage then the alternator isn't grounded and the probable cause is the main engine ground cable either breaking or coming loose.

Very best regards

Geordie

Posted on Jun 10, 2008

emissionwiz
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SOURCE: I am trying to find a 3 speed shfiter cloumn for a 1981 F100

we are a tech help site no links to parts, sorry, have you tried ebay, there are allot of vintage parts there like this column, have bought lots of parts for cars back to the 1940's on ebay.

Posted on Sep 14, 2009

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SOURCE: 84 CK TRK, 2500, 5.7L 55,000 miles have replaced

On some of the older style GM's you can take that brown wire and cut it and take the end leading from the alternator and hook it directly to the hot terminal on the alternator and just leave it hooked up and it will work. But I have ran into the occasional problem where leaving it hooked up will drain the battery when the vehicle isn't running. Hope this helps..

Posted on Oct 25, 2009

Testimonial: "I fixed the problem - the terminal at the brown wire was corroded - after cleaning and recrimping - everything works - thanks for the heads up"

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SOURCE: Ford Taurus Not Charging

check alternator, could ther be a short some where?

Posted on Feb 24, 2010

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1 Answer

Put a new alernater an still over charging


Over charging could be the result of several things including:
    Faulty Voltage Regulator
  1. A car's battery will overcharge if the voltage regulator isn't working correctly. A voltage regulator is usually part of the alternator, and is used to keep a steady flow of voltage to the battery. If the voltage regulator is defective, it will send either too little or too much charge to the battery. If it sends too much, the car battery will overcharge. The voltage regulator is easily replaceable at an easily affordable price, sometimes for as little as twenty dollars, as of 2009.
  2. Faulty Alternator
  3. Sometimes the alternator itself can be at fault. The alternator is the device that converts the mechanical power of the engine into electrical power to charge the battery. When an alternator breaks, it usually stops creating electricity for the battery, which will then eventually die. However, if the wrong alternator is placed in the car, or if the alternator is running at the wrong pace, it will create too much energy for the car battery, causing it to overcharge. The alternator is another easily replaced part.
  4. Incorrect Charger Use
  5. If a battery charger is used to charge your battery outside of your car, improper use of the charger can result in overcharging. If a battery is placed on the charger too long, it can result in overcharging, and a significant decrease in your battery's lifespan and efficiency. This is why it is important to read about your specific battery and understand how long it needs to charge to be effective. Too much charge will lead to problems.
  6. Faulty Battery Chargers
  7. Sometimes chargers can be faulty. Their settings may be wired incorrectly, or the charges labeled incorrectly. As a result, your battery may be getting overcharged, even if you are carefully monitoring your charging. This is a problem that is hard to avoid, as manufacturing mistakes can happen anywhere, anytime without warning. It is a good idea to test your charger regularly to see if it is running correctly.
  8. Heat
  9. Extreme heat in the summer can also have an adverse effect on the car battery. If the battery has been previously overcharged, extreme heat can increase the problems caused by overcharging, and exacerbate any other problems with the battery. This problem can be hard to avoid if you live in a warm climate. The only real way to ensure safety against this problem is to avoid overcharge in the first place.

Feb 27, 2011 | Ford Expedition Cars & Trucks

1 Answer

Not getting current to battery,I replaced everything new, altenator regulator celnoid Battery and still will not charge battery


Hello, I'll try to give you a few ideas. Check whether your Armature and Field wires are in the right position. Then there are your plug-in wires at the Alternator connector. To generate a charge from your Alternator you need power going into the plug-in and that power comes from the Ignition switch.

If your Ignition switch is bad or if the power is not going to the Alternator because of wiring, then the Alternator will not put out current. I noticed the year of your truck is a 1981. Sometimes if the wiring has burned up, the last connection is the dash gauge. Sometimes the gauge will burn out. If you have an add on gauge and bought the truck as-is, the wiring to the gauge may have been done wrong and took out the Regulator and Alternator.

You can put on a decent gauge wire and bypass your gauge to see if the battery will get a charge. I don't have books that far back, check with an Autoparts about a fusible link for the charging system.

I hope my solution helps you.

Feb 14, 2011 | 1981 Ford F 150

1 Answer

We seem to be constantly replacing bulbs. (headlights and signal lights). Now when I put in a new bulb nothing happens.


check alternator make sure its not overcharging if so voltage regulator is defective rev eng see if lights get too bright,regulator is built in alternator

Nov 29, 2010 | 2000 Ford Windstar

2 Answers

Alternator is overcharging now


These particular alternators do not take likely to being soaked. I would suggest changing out the alternator. What has happened is the regulator is shorted or has an open in the reference circuit which triggers it to full field and over charge the battery.

Jun 01, 2010 | 1995 Ford Taurus

2 Answers

Overcharging alternator is killing my battery. is the voltage regulator in the computer? 1992 plymouth grand voyager 3.3 v6


This year it is not supposed to be in the computer,look on the firewall in the middle,I believe it is flat,and has a three wire connector,but only two wires in the plug,see if you can find it.

Feb 26, 2010 | 1992 Plymouth Grand Voyager

1 Answer

1991 jeep wrangler: alternator overcharging


It sounds as the voltage regulator which is built into the back of the alternator has stuck. Occaisionally this even happens on new ones. Would suggest taking the alternator back as it shoud be under warranty.

Jul 06, 2009 | 1991 Jeep Wrangler

1 Answer

Blown lights and overcharging alternator (2 alternator)


this can be caused by a shorted cell in the battery, has the battery tested? and clean the battery cable's, corrosion can also cause this condition.

Mar 27, 2009 | 2003 Kia Sedona

2 Answers

1977 f 100 carging problem


run a jumper from your alternator to your battery. This is a temporary fix and should stabilize the voltage and charge the system. It seems there is a short or grounding problem somewhere between the alternator and battery, so you will need follow the wiring but given the age of the vehicle, you should change the wiring from your generator or alternator to your battery. Be sure when you are running a jumper, your gauge wire is heavy enough and make sure the wire isn't hot. This is a temporary fix so don't go on a long road trip.

Dec 06, 2008 | 1981 Ford F 100

2 Answers

I have a 1999 chevy malibu and it is over charging. I tryed a new alternator and that did not fix the problem. I tryed a new battery and that did not work either. so what do i try next


What do you mean overcharging? Put a volt meter on battery...It should be about 14.5 volts. Since you already replaced the regulator (inside the alternator) The only thing left is that the new regulator is bad. Easy to replace...place paperclip through hole in back to hold brushes until fully assembled then remove.

Aug 21, 2008 | 2001 Chevrolet Malibu

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