2001 Ford F250 not charging. Already changed the alternator.

If the battery is being drained while the engine is running it can only be because the charging system isn't charging or isn't charging enough.

When everything is working correctly the alternator supplies all the current the vehicle needs with a comfortable surplus that keeps the battery charge level topped up.

If the charging system is working correctly and the battery is becoming discharged while driving - the discharge fault would be so huge the result would be smoke and fire. As that isn't the case the obvious conclusion must be a charging system that is defective.

Mega fuse ford. - YouTube

? 1:35
https://www.youtube.com/watch?v=o9npBfNjKsU
Dec 2, 2013 - Uploaded by Mn09lfV6f
Mega fuse ford. .... Thanks Bud you saved me from getting analternator! I didn't ... 8:39. How to Find and ...

Part 2 -How to Test the Alternator (Ford 4.6L, 5.4L).

troubleshootmyvehicle.com > Ford > 4.6L, 5.4L

Mar 1, 2011 - The newer Ford vehicles use an inline fuse that goes by the name ofMega Fuse. So, before we can condemn the alternator as BAD, we need ...

Where the heck is the Mega Fuse pics needed. - Ford Truck ...

www.ford-trucks.com > ... > Super Duty & Heavy Duty

Jun 5, 2010 - 2001 F250 5.4 V8 4x4. I have had ... Even tried a new alternator and the battery light still stays on. ... 04 F350 XLT 4x4 6.0L SC/LB 4x4 ... I looked there and see one line marked FUSE but there is no mega fuse on it. .... 2005 F-150 Lariat having huge charging issue please help me, JoeJN, 2004 - 2008 F150 ... Installed battery backwards, truck wont start.
Jan 17, 2012
charging problem 99 5.4
Feb 20, 2010
2001 F150 Fuse Box Diagram
Jan 23, 2010
Fusible links and inline fuses?
Sep 17, 2009
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I would reccomend you go back to the alternators again. Have it tested. There are many bad parts going over the counter these days, and I have replaced"new alternators" 3 times before getting a good one.

make sure the cables are both good if they have a spot that feels flimsy the wires inside are likely corroded and the current is not running through it properly. a simple charging system check would be recommended.

Just a thought.......... If the alternator is not grounded properly to the chasis , it will not charge , and the charge light probably will not come on either. Check for loose , or corroded ground wire or strap.

mcdevito75 here, Have your alternator checked for chargeing. With the A?C on the engine is undera load a turns just a liitle slower, this can bring out a faulty alternator. You local shop could check this for you.

erg, ford... have the dealership troubleshoot.

change battery your better could be shorted out

hi i would check catalitic converter first thing good luck

has anyone thought about the regulator, i think that its built into the alt, replace it and then see if the prob continues, you can get a pass on the alt test and still have a bunk regulator