Question about 1999 Ford Super Duty F 450

1 Answer

I have a 2000 F450 7.3 PSD I changed both batteries and alternator and still getting no output power from alternator causing the batteries to run down I changed batteries 3 times and alternator two times What is the solution?

Posted by on

  • rpontonsr_60 Jul 29, 2010

    Sorry it does not have a fuse had to take it mto a shop. Thanks Ron



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.


    An expert whose answer got voted for 500 times.

  • Master
  • 2,468 Answers

I believe there is a fuse located inline off the alternator wiring cable,check this if so equipped

Posted on Jul 29, 2010


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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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 repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Im having a problem not getting enough voltage running through the truck put a brand new alternator on and when my truck attles my headlights go dim nd it shuts off

Have a load test done on the battery to check for cell failure as the alternator may be putting all the current into a shorting battery. Check the output of the alternator as the regulator may be faulty. Alternators produce 14.5 volts at 2000 rpm and the current is set according to requirement. That is with 14.5 volts and full current draw the alternator is capable of producing the rated amps ( up to 120 amps) If you have extra power requirements ( driving lights --massive amplifier) the total current draw may be more than the rated amp of the alternator and so the battery will eventually run down and there will be insufficient power to run the ECM and it will stop.

Nov 11, 2014 | 1984 Ford Ranger

1 Answer

Lost power while driving

Have you checked alternator output on the truck ? There should be a fuseable link wire protecting alternator output that could be fried.
What does the gauge or warning light do ?

Feb 19, 2014 | Ford Cars & Trucks

1 Answer

Low voltage output from alternator

14.5V output. is to spec on a new alternator
at rest battery will be 12 volts
whats the problem

Apr 16, 2017 | 2006 Hyundai Accent

1 Answer

I have a 2000 lincoln towncar limo car was running greati stopped to get gas and when i went to start i had no power.i boosted car and got it home,changed battery but i still have no power at all (even...

Hello info49624

you have done everything right so far. now since what you have done didn't work. This could only mean that your Alternator is no longer working. The purpose of the alternator is to keep the battery charged up so all your car functions work. The alternator stands by to restore the electrical charge used to crank the engine. It , once the engine is running, charges the battery and runs the electrical system of the car. It typically takes about twenty miles of driving to restore the charge to the battery from starting the engine. Most alternators are internally regulated to assure proper output voltage . Older cars have alternators with external regulators There are some exceptions to this but this true in the majority of cases. One of the exceptions is a high current alternator for a Lincoln that delivers 120 volts AC for receptacles (the same as at home) in addition to the charging of the battery.


Jun 02, 2011 | 1999 Lincoln Town Car

2 Answers

4runner is overcharging...up to 17 volts at 2000 rpm

Replace the alternator,this is from a voltage regulator problem,and have the battery checked out,if it has a short in it,or bad cell,it can cause this problem,but change the alternator.

Apr 22, 2010 | 1993 Toyota 4Runner

2 Answers

I have a 2000 Dodge grand caravan, and the battery won't charge while the car is running, it just keeps using the battery until its dead. We have replaced the computer, and had the alternator and battery...

Hello allyssiandra.
The green wire leading to the alternator is grounded by the computer to complete the field circuit.
The dark green/orange wire is power supply to the field circuit fed by the auto shutdown relay.
The large output wire out of the stator in the alternator should have battery voltage on it at all times. Test to verify this power at the alternator terminal. There is a fusible link in this feed wire that could have went open circuit.
To test the system manually ground the green wire with the engine running. This is called a full field test. This will put the alternator in full output. If it doesn't, apply positive battery power to the dark green/orange wire with the engine running. This bypasses the auto shut down relay.
Hook up wires at the alternator before starting the engine for safety sake.
Do this much and report back here to me and I will help with the next step in repair.


Apr 03, 2010 | 2000 Dodge Caravan

1 Answer

I own a 2000 mazda mpv, battery light was on and a changed an alternator and light is still on and not charging my battery. What could be the cause?

you probably got a defective alternator...this happens more than it should...perform alternator output test at 2000 rpm you should make 13.6 volts and up to 100 amps of power under load.

Sep 27, 2009 | 2000 Mazda MPV

3 Answers

My 2000 Mercury Cougar starts ok then after a few minutes the dash gages drop to zero then starts to struggle to keep running then dies and will not restart unless I charge the battery. I was told maybe...

check fuses alternator fuse ,charge fuse.also if that checks out look at the harness for back of alternator is it in bad shape? is there a large wire by it self bolted on the alternator? if so take a wire ,same size,and bolt it on with that wire and run it directley to the positive battery post this will charge battery for now on,but if u dont have a large wire bolted on alternator ,the larger wire that is pluged into the alternator is the same wire ,tie into this wire really good and do the same (run to battery positive post) make sure this plug in is good ,if not u can purchase this at the zone

Jul 04, 2009 | 2000 Mercury Cougar

2 Answers

Squealing losing power not chargeing batter changed alternator

If the belt is 3 yrs old or older, change it. If it has oil or anti-freeze or grease on it, change it. If new, add more tension to the belt.

May 13, 2009 | 1994 Isuzu Rodeo

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

Related Topics:

60 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

81400 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22359 Answers

gerry bissi

Level 3 Expert

4376 Answers

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

Answer questions

Manuals & User Guides