Question about 1991 Ford F150

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F 150 won't charge

1991 f 150 new alternator, battery, computer, selinoid when the battery is full charged it will drop volts only when the truck is running, is this any thing you might know about

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It sounds like a short somewhere in wiring draining your battery. You might try a different alternator it mite be faulty

Posted on Aug 21, 2008

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2 Answers

Voltage drops when setting still has new battery and alternator


Check grounds. Look at your cables. Could be corrosion.

Oct 30, 2015 | Cars & Trucks

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2003 Saturn vue awd 3.0 testing showed alternator putting out about 1/2- we replaced the alternator & the serpentine belt,- red wire?the new alternator in did not solve the problem-battery is new-


How do you know it's only putting out about 1/2 ? an 1/2 what ? Amps or volts ? Did you hook up a volt meter to the battery posts ? red to red an black lead to negative post of the battery ? Does it show 13.1 to 14. 1 volts with the engine running , if so it's charging . The only thing that would cause the alternator not to put out full charge amps would be a bad diode inside the alternator or a power or ground issue. You need to check power an grounds doing a voltage drop test . Voltage Drop Testing the Charging System

Oct 26, 2015 | Saturn Cars & Trucks

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Hi there.i am checking my dads 1991 ford l8000 dumptruck as its not charging.it has the alternator with the internal regulator.how do i check the out put at the alternator itself?i work on 18 wheelers and...


To check if alternator is charging! Connect a volt meter to the battery and start the vehicle......the volt meter should read above 12 volts, if lower then alternator not charging properly!

Nov 06, 2014 | Cars & Trucks

1 Answer

My 1991 f250 battery keeps dying while running


The alternator is not working. When running, a voltmeter on the battery should be at least 13.5 volts, showing the alternator is working and the battery is being recharged. You have a charging system malfunction. check the connections between the battery and alternator. Check battery ground, engine grounds, and engine to body strap ground.

Feb 13, 2014 | Ford F-250 Cars & Trucks

1 Answer

The battery won't stay charged


Hi it is possible that you Alternator is faulty,if you have access to a VoltMeter ,check the battery voltage in the morning before you try to start it you should have around 12.7 volts for a charged battery if not fully charge your battery again and check the voltage with your car running you should have around 14 volts with the engine reving at 1500 revs.ifyou get around 12 volts then your lights are taking more power from the battery than the Alternator can replace.You could also get your local garage to Drop Test your battery to see if any of the Cells are faulty

Jan 11, 2013 | 1987 Volvo 740

2 Answers

There is a ground some were that is causeing the battery not to charge put new selinoid ,new battery,alternater,new key lock cylender check wirers fuses relay switches and battery still wont charge


It sounds like you have done a whole lot of replacing and not much "diagnosing". Did you chech for battery voltage at the alternator? There should be battey voltage at the large Black/Orange wire that is on the B+ terminal of the alternator. This wire should have voltage all the time. If there is no battery voltage, you most likely have a burned fusible link at the starter relay area.
There should also be voltage at the "S" terminal with the ignition on. If there is no voltage, then check for voltage at the "S" terminal of the voltage regulator. If there is no voltage at the "S" terminal on the voltage regulator then check the "I" terminal on the regulator for voltage.

NOTE: The voltage on the "S" terminal should be 1/2 that of the voltage on the "I" terminal.

If there is voltage on the "I" terminal, make sure your voltage regulator is grounded properly to the fender and retest to see if it is charging the battery. If it is still not charging, disconnect the regulator connector and connect a jumper between the "A" and "F" terminals of the connector. Start the engine. The alternator should now be charging the battery at high voltage (usually over 15 volts) If it does, replace your voltage regulator. If it does not, then you need to check your wiring between the voltage regulator and the alternator.

Please also review this article:

What Else Could Be Wrong?

Jun 15, 2011 | 1987 Ford F 150

1 Answer

I have alternator charging battery problems on my 1991 Chrysler Lebaron LX 3.0 Liter V6 Convertible. Any ideas?


hello there:
you're problem may be in the alternator or the battery to find out you will need a volt meter and have the vehicle running to test the alternator set you volt meter to dc voltage and touch the positive side with the red lead and the negative side with the black lead you should show 14 to 14.5 volts if not replace the alternator then with car off using the volt meter and test the battery the same way you should get 12 to 13 volts then wit the volt meter still hooked up to the battery with the help from someone try to start the car and see if the voltage drops below 10 volts if so the battery might be shot....hope this is helpful best regards D.Jones p.s please leave a review thanks

May 30, 2010 | 1991 Chrysler LeBaron

1 Answer

Check charging system


So you have a new alternator. I S IT CHARGING ? If the answer is yes , and the battery still dies, I would say there is a 12 volt drain in the electrical system. Hope this helps

May 21, 2009 | 1991 Cadillac DeVille

1 Answer

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

Jun 10, 2008 | 1982 Ford F 150

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