Chosen Solution
I have a 2003 Ford Explorer Sport. 4.0 V-6. Just bought a brand new Battery for it (3 days ago) and it’s drained dead. Entire Charging System checks out good, as does The Starting System. The entire Wiring Harness checks out good also. Tested Starter, Altenator, Voltage Regulator, and Starter Relay. All check out fine. The Ford Dealership can’t figure it out. I got almost $2,000 stuck in it from The Ford Dealership and I’m just about done. So what’s the problem?
you have a loaded current some where,you can take two steps,first checking for drained power by removing main power relays in main distribution fuse box,then checking by removing fuse after one till you explore the drain power line.
