Hey all, anyone’s windshield wipers only work on full
speed and no squirters?
thanks

 

the multifunction switch is a MUX circuit. different switch positions change the voltage setting the module sees....the module sees different voltage as a command. If I had to guess I might go to the bone yard and try a multi function switch.

It could also be high resistance in the circuit wiring.

 

Wiper motor pulse board, its mounted on top the motor. Very common issue on these trucks.