Ford 2006 Explorer Owner's Manual page 264

Roadside Emergencies
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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
raidator support. Keep the negative (-) cable away from the battery and
the carburetor/fuel injection system. Do not use fuel lines, engine rocker
covers or the intake manifold as grounding points. Ensure that the
battery shield is properly installed before jump starting the vehicle.
264
2006 Explorer (exp)
Owners Guide (post-2002-fmt)
USA (fus)