Smoke from wiper stalk...

[MontanaManche]

Today I was driving my truck around testing my new tires in the rain and after about 30 min of driving around with my wipers on, a large puff of smoke started pouring out of the wiper stalk area. After I turned off the wipers the smoke stopped and didn't seem to come back. Anyone have an idea why? One of my biggest fears is my truck burning down and id like to figure this out. I might just get a new turn signal switch but I'm not sure yet.

[eaglescout526]

Do you have intermittent wipers?