2001 Ford Ranger with automatic transmission came in with fuse #2 in the interior fuse block blowing for the customer daily. Customers main complaint was that the a/c would stop blowing when the fuse would blow.
Inserted fused jumper wire that uses ATO/ATC fuses. Cheaper fuses to blow and can access wiring to do amp draw testing.
Ran vehicle and operated a/c while wiggling wires. No problem found. Moved vehicle and fuse blew as shifter was moved through reverse. Checked reverse light wiring (okay). Fuse would no longer blow. Drove vehicle, no problem. Consulted wiring diagram and found that fuse #2 supplies power to the overdrive switch and I knew what the problem was. Removed lower panels and steering column shroud and found the shorted wiring harness for the overdrive switch at the shift lever pivot point.
Locate and disconnect O/D switch harness connector and confirm that the short is gone.
The actual short is shown in the last picture. It is the copper colored spot just above and slightly left of the shifter pivot pin. Wrapped with live rubber tape and electrical tape and reassembled. Fixed!!!!