Glad I found you guys

Maybe I can get some help taking care of my daughters 2010 Sebring. Only 90xxx miles but things are falling apart. Already had to replace an injector. Thankfully it was on the front side of the 3.5 engine because those back bolts are impossible to get out. Also replaced the turn signal switch last year. She's had it in the shop for a few other things but I'm willing to try some it myself. Now I'm faced with a stuttering wiper operation. I was sure it was the switch, so I replaced it. No change. Then I convinced myself it was the motor. So I replaced it. No help. Still stutters with an occasional full swipe every now and then. I see there is a wiper motor relay for sale, but cannot find where it goes. Any ideas would be appreciated.