I purchased a 2000 Excursion one month ago. I have replaced all 5 locking mechanisms (4 doors and hatch) which were all out when I bought it. They would not lock or unlock with the electric lock button or remote...all manual. Within one week, one went out. Then a second another week later. Just today, another went out. I have checked the 4 contacts that are under the dash in the center just behind the firewall and those are fine. I have no idea at this point but to find out something on these forums or take it into the dealer. My brother also owns the same 2000 Excursion with the same problem and has also replaced the actuators. I can only assume at this point that there is a defect since we both have the exact same problem and have serviced it the same way so far. Anyone with any suggestions as to what is next?