My front washer decided to stop working a few months ago. I've replaced the motor which didn't work then thought I'd change the switch which also didn't work. I bought an incorrect switch which has rear washer which my car doesn't have but tried fitting it anyway.Now I can get it working if I engage both the rear washer switch and the front at the same time.

So I'm guessing a ground issue but I just cannot find where it is grounded. The wires from the pump connector are black and back/violet and they appear to go into the main loom at the front so assuming it must be grounded somewhere near the fuse box. Checked behind the driver speaker. Any ideas where else to be checking?