Just replaced the battery and alternator in my '99 F150 4x4. Ran fine for a couple of days, then the battery light came on, and the next morning it started fine ran about 100' and died again. The evening befor when I pulled into the driveway I heard a loud pop and the truck died, but then it started right back up. Anyone have any suggestions or solutions?

 

Make sure your connections are good and clean... If you think something is draining the battery, some sort of short, put a multimeter on the battery, look at what it reads, than one by one, start pulling fuses... if the voltage jumps after you pull out a certain fuse, than trace whats circuited to that particular fuse you took out and check it out

 

AHHHHHHH wish i got to earlier.... had the same problem your gona laugh if you got the same problem that i did..... on the passenger side you have a cover that your main electrical harness hides behind.... when you pull off that cover theres is a little fusebox that will be in that little cluster of crap.... open up that little fuse holder and check that fuse..... thats probably going to be your problem!!!!!!