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What would be wrong if when you shut off the engine of your 1992 Grand Marquis and windows windshield wipers still work could this be?

There are a few possible reasons why your windshield wipers and windows would continue to work after you turn off the engine of your 1992 Grand Marquis. Here are a few things to check:

* Ignition switch: The ignition switch is responsible for providing power to the various electrical components of your car, including the windshield wipers and windows. If the ignition switch is faulty, it may be allowing power to flow to these components even when the engine is off.

* Wiring: The wiring that connects the ignition switch to the windshield wipers and windows may be faulty, allowing power to flow to these components even when the engine is off.

* Windshield wiper motor relay: The windshield wiper motor relay is responsible for controlling the power to the windshield wipers. If the relay is faulty, it may be allowing power to flow to the windshield wipers even when the engine is off.

* Window motor relay: The window motor relay is responsible for controlling the power to the windows. If the relay is faulty, it may be allowing power to flow to the windows even when the engine is off.

To troubleshoot this issue, you will need to check the ignition switch, wiring, windshield wiper motor relay, and window motor relay. If any of these components are faulty, you will need to replace them.