Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.
Have actuator movement and loaded electrical supply checked before selecting a relay, switch or actuator for replacement.
Source: This question and its visible discussion. The roadmap distinguishes the original owner's reports from other participants' experiences; proposed follow-up is editorial guidance, not a confirmed diagnosis. Fluke: Diagnosing voltage drops https://www.fluke.com/en/learn/blog/automotive/electrical-automotive-troubleshooting General support for loaded circuit testing; use matching vehicle specifications.
Check the gauge and power fuses first, then identify the failed component with a continuity test or jumper wire. Possible causes include a failed ignition-switch contact or the main electronic control relay module.
A 2000 F-150 owner reported that the power door locks would not work from either switch, although both locks moved slightly when a switch was operated, and asked whether the relay or both switches had failed. One reply suggested the relay, and another described using silicone grease on the actuators of a different vehicle. The expert recommended checking the gauge and power fuses, then using continuity or jumper testing to identify the failed component, noting possible failure of the ignition-switch contact or main electronic control relay module.
F-150 power door locks
Both power locks on a 2000 F-150 moved slightly but did not complete their travel when either switch was used. Replies suggested a relay, actuator friction and electrical checks.
Reported outcome: No diagnostic result or successful repair was reported.
Another owner's lubrication result on a Windstar does not confirm the cause here. The thread's jumper instructions are not a vehicle-specific test procedure.
