FORD 2010 Explorer v.2 - Manual (Page 330)

3. Connect the negative (-) cable to the negative (-) terminal of the
assisting battery.
4. Make the final connection of the negative (-) cable to the ground stud
located toward the front of the vehicle (forward of the battery) on the
radiator support. Keep the negative (-) cable away from the battery and
the carburetor/fuel injection system.
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Roadside Emergencies
330
2010 Explorer (exp)
Owners Guide, 2nd Printing
USA (fus)