Question about Ford F-250

1 Answer

Not charging 1999 F250 - same issue, not charging. Alternator with internal regulator (tested on and off truck) is good, battery is good, no fuses blown. Any suggestions on what else could be the problem?

Posted by on

  • 3 more comments 
  • craig896 Oct 10, 2008

    1999 Ford F250 Light Duty Super Cab. Battery is not charging. New battery new alternator (even though the old one tested ok). There's an orange wire coming from the internal voltage regulator. This wire has continuity from the regulator to the fuse box under the hood. The fuse is good. There is no continuity between the fuse box and the battery. Bypassing this wire with a jumper directly to the battery makes everything work. Alternator starts working, battery starts charging, warning light turns off. My mechanic want $200 to track down the fault in the wire. Does anyone know if this wire can be bypassed safely without having to trace it all around the engine compartment looking for the break?

  • Al LaBonte
    Al LaBonte Oct 26, 2008

    I'M having the same problem, But to add to it my battery light doesnt come on anymore either. when you turn the key to the on position ,Could this be one of the problems ??

  • marnix01 Jan 23, 2009

    only diffarance i have is its a f260 6 cylinder 1988 and the only thing i have not replaced is the altenaor wiring harnes including fusable link

    the car starts with a new battary but continues to give a 12 volt reading at the battary

  • Anonymous Mar 14, 2014

    1997 saturn alternator runs and test good just dose not want to charge battery

  • Anonymous Mar 24, 2014

    new alternator all fuses good



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 321 Answers

Possibly a fusible link somewhere in the circuit has burned through and disconnected the circuit.A wiring diagram would be needed to look for the location of any fusible links Ohms check the wires involved in the alternator charging circuit to verify continuity.

Posted on Aug 29, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Where is the alternator fuse for a 2005 mod landcruiser sahara?

Hi Charles
I haven't seen an Alternator with a Fuse.
They Generate 35-55 or more Amps and are usually connected directly to the Battery Positive. Check at Alt. Main Terminal with MultiMeter. Check for Good Ground.

The small wire on the back of the alternator often comes from Ignition Key + to control the charge rate.
The Modern Alt. also has an internal Regulator Circuit to control charge rate.

If trying to save money.... Alternators can be split open on the Bench and repaired. Just put a mark across joint before opening.
Use a brush hook (make one) to hold brushes back while re assembling.

Items to watch for:
Brushes Worn Out - no juice to Rotor to excite (generate)
Diodes Blown - (Multimeter Test on Diode Function for shorts / open. Simple Unsolder, Press out & replace
Regulator Blown - Buy replacement
Stator Coils Corroded or Shorted/Open or bad solder joints.

Remove Alternator & Bench Test.

Good Luck
Alternator automotive

How to diagnose and repair bad alternator in your car or truck

Jan 08, 2016 | 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

New battery and new alt. but still doesn't charge 1999 f 150

check that the new alternator has the right type of regulator for it . If you have an internal regulated alternator on a car that has an external regulator then it will not charge . Both look the same but it may have int -reg on the housing some where.

Jan 28, 2014 | 2003 Ford Focus

1 Answer

1992 holden barina charging problem already replaced alternator but still slowly drains battery

It is not charging the battery because of several problems ---1 when connecting up the wires to the alternator was there a spark at the connection ---2 is the heavy wire on the alternator insulated from the body of the alternator--- is there a fuse in the charge circuit that is blown---4 is the light wires pushed fully home in the connection--- have you the correct alternator for the car ( internal or external voltage regulator)---5 is the drive belt in good condition and tight- If everything checks out then take it to an accredited auto electrician to have the alternator tested properly as new alternators ( out of the box new) can be faulty.

Jan 21, 2014 | Cars & Trucks

1 Answer

Battery not charging..good alternator...internal regulated alternator

that year 1986 alternator voltage regulator either external or internal follow alternator battery feed wire if you see battery feed wire going to black box mounted on fire wall you have external voltage regulator.if voltage regulator okay problem could be alternator fuse or fuse link could be faulty battery cables if cables over 20 years old but make sure alternator drive belt tension correct.

Oct 27, 2013 | 1986 Chrysler LeBaron

2 Answers

1996 jeep cherokee sport gen light has come on and only charging 9.96 volts when i test with multi meter at back of alternator do they have external regulator wich can be replaced

no all cars are internal now make sure the ALT fuse in the relay center is not blown ive seen this happen someone puts an alternator in and it wont charge because fuse is blown

Aug 17, 2010 | Jeep Cherokee Cars & Trucks

1 Answer

2002 Ford F250 V10 new alternator good battery but it dies while you are driving

Does the battery charge even after it drains. Even though it's a new alternator, it could still be bad. The battery could even have a dead cell because it's draining while you're driving. Sounds mainly like the alternator output isn't enough. Internal voltage regulator inside the alternator is usually a big problem, it can't be replaced, except by a new alternator or have yous rebuilt.

Jan 05, 2010 | 2003 Ford F250 Super Duty Crew Cab

1 Answer


check for a blown fuse,sometimes if the battery cable is connected when changing an alternator it overloads the fuse,also check for power at any fusible links

Oct 21, 2009 | 1999 Ford Expedition

1 Answer

1999 f250 will not charge battery

It appears that the alternator is still not charging the battery.Charge the battery up,and refire the truck.Check voltage with a voltmeter,directly off the back of the alternator.Most all alternators of your year model have the voltage regulator built into the alternator.If the alternator isn't producing any voltage,then it is bad,even if it is new.I have had defective new parts before.

Aug 10, 2008 | 2000 Ford F250 Super Duty Crew Cabs

3 Answers

Somerset Alternator

the voltage regulator is internal on that alternator. Take the alernator back off and take it autozone or advance and have them bench test it to see if its good or not. That model car doesnt have a fuse for the alternator either and the regulator is internal on that model. Thats a standard sg gm alternator. those above stores do not charge for testing it for you. another quick way if you have a volt meter is black end of volt meter to the negative battery cable and the postive end of the meter to the thick red wire on the alternator that you had to put the nut on. then with car running that should show 13 to 14 volts. If not, suspect that alternator. But try the free check on it before going through too much more grief with that. if you had it tested. take the whole car to the autostore and ask them to check it while the car is running, Autozone and advance both have the machine they will take out to the car and check it for free. Otherwise, get a volt meter and check it as I said. If the alternator is putting out, then you have a bad cable or the 'field' wire is bad.

May 14, 2008 | 1986 Buick Somerset

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

1,160 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

77499 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers


Level 3 Expert

5608 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides