Ford Expedition 2009 Owner's Manual page 806

Roadside Emergencies
Jump starting
1. Start the engine of the booster vehicle and run the engine at
moderately increased speed.
2. Start the engine of the disabled vehicle.
3. Once the disabled vehicle has been started, run both engines for an
additional three minutes before disconnecting the jumper cables.
Removing the jumper cables
343
2009 Expedition (exd)
Owners Guide, 2nd Printing
USA (fus)