Windshield wipers will no shut off.

How are the tires ? it may be time to buy a new one.

take all the connectors to the wiper motor apart, clean, put together and water proof them.

It is a Chevy chassis

What chassis? Ford or Chevy. On a Chevy water could have got in the wiper motor connector or the cable for the steering wheel could be chaffed, check the bottom of the steering column. Several years ago people posted about the issue here. Don't know about Fords.

I had that problem on a car I once owned. The problem was the ground wire. I don't know where your ground wire is, but if you find the wiper motor and start tracing wires you should find where the ground wire attaches to the frame. Intermittent electrical problems are hard to trace and can be caused by a loose connection. JMO