2 days ago, after days of the motor getting slower n slower, my wipers packed up. I took the risk and bought a second hand motor & linkage for £30. The garage fitted the part today and at first i thought it worked fine UNTIL I tried to park the wipers (which only stops when I take on hand off the stalk) and the screen wash pump does not work. The rear wiper is fine.

Can anyone offer advice?
I have seen the mod for earthing the motor but I do not have the tools to do so?
Is my motor on the way out?