possessed

[Tx Firefighter]

It'll be the module between the wiper switch and the wire harness plug. It goes inline in the circuit.

To diagnose it, unplug the wiring harness and then remove the delay module off of the switch. Now, plug the wire harness directly into the switch where the module plugged in. You now have non intermittant wipers. Drive the truck awhile. Once you're convinced the problem is gone, replace the delay module with a new one.