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To test the GEM (Generic Electronic Module) on a 2002 Ford F-250, you'll need to use a diagnostic scan tool compatible with Ford vehicles to check for any trouble codes related to the GEM. Additionally, you can visually inspect the module for any signs of damage or corrosion. Testing the wiring and connectors for continuity and proper voltage can also help identify issues. If necessary, you may need to perform specific functions or tests using the scan tool to ensure the GEM is operating correctly.

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