If the door lock relay has any internal or wiring issues it can cause the door locks to function intermittently.
Motor door lock wiring.
Power door locks do not function.
The door locks may function correctly one moment and in the next will cease to operate.
This was fairly easy to install i only needed two screws to hold it to the inside of the door and with a couple of creative bends the actuator rod clamped right on to the manual lock unlock rod.
Cedar avenue fresno ca 93726 united states of america 559 486 5444.
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Works perfectly as a replacement for the original power door lock motor in a 1986 f250.