I have a 2005 Expedition in which the rear latch won't lock. The doors and
rear window lock and unlock, but the rear latch will not lock. I took the
rear panel off and put a test light on the wires. There are two sets of
wires and I tested both. One set has a wire that lights when I lock, but
the other set didn't light at all. Does this look like a defective latch
mechanism or should there be power to some of the other wires? Thanks in
advance for your help.