Where is the wiper circuit breaker on a 1989 Jeep Wrangler 4.2L?

There isn't a dedicated circuit breaker specifically for the wipers on a 1989 Jeep Wrangler 4.2L. Instead, the wiper motor is protected by a fuse. You'll need to consult your owner's manual or a wiring diagram to find the correct fuse location and amperage. The fuse box is typically located under the hood or inside the vehicle, often near the steering column.