start out, drive about 20 minutes, get on the Interstate and the battery light comes on 2008 F 150 5.4L 4X4 - 57K miles..... get to my destination, went about 20 miles, turn around to come home, without turning the truck off because of the battery light being on and I notice the charging gauge drifting down to the left, get back on the Interstate and the wipers are slowing down and lights on the dash are dimming.....go around 15 more minutes I lose all lights on dash, wipers, defroster everything, charging gauge is now pegged all the way down to the left and the truck is starting to act up running like ***** so I barely make it off the Interstate and call a flatbed, I guess I was about an hour into the trip ..... battery is only about a year old and it started fine that morning and the day before when it was about 12* here in Philly...... dealership had the truck, just gave me a call and said they can't find anything ?? ..... never a days problem since I bought it new in late 07' need opinions fellas

thanks

 

Did they pull the codes from the computer? I believe your charging system is tied into the computer system. They should have gotten some sort of code in the memory of the computer, like low system voltage or something like that. That would at least confirm to them that you were not dreaming this up.

 

Alternator is where i would start. Have it tested.

 

I'll ask about this this morning, thanks

 

just got the truck back, they replaced the alternator and battery, will let you know how it makes out.

 

When I was young and did not know better had the same problem on a 1967 Econoline with the 170, 3 on the tree. Problem was a loose alternates belt.