The mini fuse is intact as well as all the fuses in the circuit. Power is where it's supposed to be and grounds are intact. The alternator puts out 18 volts when the IAR is grounded at the test point.
Wiggle tests showed no irregularities and I'd rather not be opening the harness unless I have to. The circuit is fairly simple with only a clutch interrupt switch and ignition switch involved. I get the feeling this is a unique problem and am totally stumped as to how to proceed.
Being able to ground the IAR and have the system work properly is really throwing me, especially since now it no longer does that. This is making absolutely no sense.
BTW-thanks for responding. I was an ASE certified Ford wrench for ten years specializing in EECIV systems and driveability. I've never run across this.
Friday, September 17th, 2010 AT 1:43 PM