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Where is the overdrive fuse on a 1993 Ford Aerostar?

There isn't a dedicated "overdrive fuse" in a 1993 Ford Aerostar. The overdrive function is controlled by the transmission's electronic system, and any issues are usually related to the transmission itself, its solenoids, the PCM (Powertrain Control Module), wiring, or a sensor, rather than a simple fuse.

If your overdrive isn't working, you'll need to troubleshoot the electrical system related to the transmission. This will likely involve checking for power and ground at the transmission's electrical connector and potentially inspecting the wiring harness for breaks or damage. A professional mechanic or a detailed wiring diagram specific to your Aerostar's year and engine will be necessary for accurate diagnostics.