On a 1995 GMC Vandura, if the wipers are stuck on and won't turn off even with the engine off, the most likely culprit is a
faulty wiper motor switch. This switch is the part that controls the wipers' operation, and if it's malfunctioning, it can get stuck in the "on" position.
While it's *possible* other components (like a short circuit in the wiring harness) could be at fault, the switch is the most common failure point in this scenario. Replacing the switch is usually the first troubleshooting step.
