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Police Force car motor uses two drivers

The police car motor runs from +25 V through two driver outputs: one switches the motor on and off, the other drives a relay that swaps the motor polarity to reverse it. If the car runs only one way, test the reversing relay and its driver; if it never runs, test the on/off driver.

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Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer