Hi Thomas, I am a believer in the fault likely arises from the last action you took - you removed the washer pump and put it back into place - therefore by my thinking you have likely disturbed some element of the power supply wiring, most likely the earth.
But perhaps that's just me being optimistic. Don't spiral to conclusions until you can get a meter onto the pump terminals to confirm you have the correct voltages where they should be.
N6 JMX