My 1978 Dodge truck wipers just randomly stopped working on an icy day. The fluid spray, same switch works fine. No movement on the wiper arms. I read online, check the fuse. I do not know which fuse is what? ANy help would be great

 

well, there are only so many fuses. see if any are busted lol. also, could be the motor itself.

 

Go here and go to wiring Diagram.... MyMopar

 

I recall the wipers are one of the circuits that aren't protected by a glass fuse. The wiper switch gets its power straight off the accessory bus bar of the fuse panel. It's a solid light blue wire.

However, the first thing I would check is a bad ground as these motors are rubber mounted. You could try connecting a ground wire to one of the two long motor bolts (picture below). This trick has worked for me twice.
If that doesn't work the second place I would look is the bulkhead connectors on the firewall as they are know for having corrosion issues due to lack of a weather seal.

Tip: In the winter I've made it a habit to make sure I turn off my wipers when parking. I also check to make sure my wiper blades are free before starting them after a storm.
The reason for these precautions is to protect the wiper motor from a stall condition that could burn it out. There have been a few times I've forgotten and had to turn the whole truck off, get out and break the wipers free from the ice. Simply turning off the wiper switch won't work in a stall condition because the wipers must complete one cycle before the parking switch (inside wiper motor unit) opens the circuit.



Try adding a ground wire to one of these bolts. They are long and go the full length of the motor casing. I would only remove one.