FORD 2009 Explorer v.3 - Manual (Page 332)

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. Do not use fuel lines, engine rocker
covers or the intake manifold as grounding points.
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Roadside Emergencies
332
REVIEW COPY ——
2009 Explorer (exp), Owners Guide (own2002), 3rd Printing, Market: USA
(fus)