It will if you don't clean and lube your linkage, especially the wiper spindles. They're the things that normally seize up.
Ive been through the motors . On these buses and other vehicles. There are the answers on this forum with a simple search Anyway ... If you want to get a few more years . Pull back the dash . Acces to the right side of bus, And remove the wiper with the linkage . In one. Put new rubber seals on the spindles. The motor if full of 40 year old hardened grease , Take it apart . Clean and lightly re grease . Youll see it . Sand the brushes .on the motor. Mark the spindle orientation on the arm . If your brave ,, It wont be lightning fast but it will get you throuhgh a few more years. If they were cheap .i wouldnt be writing this,.,,,, Enjoy