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To test the fuel tank selector switch in a 1988 F-150, first ensure the vehicle is in a safe and stable position. Disconnect the battery to prevent any electrical short circuits, then remove the switch from the dashboard. Use a multimeter to check for continuity across the switch terminals while toggling between positions; a properly functioning switch should show continuity in one position and none in the other. If the readings are inconsistent or absent, the switch may need to be replaced.

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1mo ago

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