Windshield wipers won't work when it rains ???????????

your motor is alrite but the arms that attach to the motor are binding up as they turn you can see it inside the trunk remove the outer cardboard pieace and its rite ther

check your ground to the wiper moter,

I had my wipers blades changed about 3weeks ago and when I had my car back they where a bit slow to work at first and then they just stopped and won’t go at all .now sometimes they go and sometimes not .my car had a mot and service at the same time .should I go back with the wipers