my yj windshield wipers don't appear to be running correctly. sometimes they work sometimes they don't.

i don't think it's the wiper/turn signal stalk or the wiper motor... is there a module or something that i can replace (parts are getting harder to find for this 20 yr) and change easily?

thanks

4.2 '87 yj, 263,000 miles, mopar mpi, 33" mud bfg, skyjacker 4", 3.73 gears, arb lockers-f and r., tom wood's 2.07 shaft conversion, tom wood's hd driveshaft, magnaflow/custom exhaust, 4wd bumper/swing-out tire carrier