Well my wiper motor died today. Thankfully after the deluge had reduced to drizzle and about 4 miles from home.
It died in mid wipe on the return stroke. Once I got home I discovered the motor was still running and if I pulled the arm down it would start working again at least to park the arms. The arms travel seemed to have a notchy feel mid stroke. hmmmmm figured it as gear trouble. Pulled the plastic cover over the gear box and park contact switch and discovered that a sure enough a section of the large nylon gear was stripped away and of course the worm drive gear would just spin merrily away until you pushed the arm onto good teeth.
To make a long story short I'd suggest anyone who has a Fox chassis car ( mine's an '87) should pull that cover and clean and regrease the gears and slip rings on the park switch. Inside mine was a crumbly dust combination of nylon gear material and dried up grease.
I'll pick up a good used one from a friend tomorrow and you can bet you I'll be regreasing that damn gear before installing it!
More rain forecast so I have a fresh coat of RainX on till then! StuK