FORD 2003 Explorer v.2 - Manual (Page 201)

2. Connect the other end of the positive (+) cable to the positive (+)
terminal of the assisting battery.
3. Connect the negative (-) cable to the negative (-) terminal of the
assisting battery.
4. Make the final connection of the negative (-) cable to the provided
jumpstarting bolt.
Do not use fuel lines, engine rocker covers or the intake manifold as
grounding points.
Do not connect the end of the second cable to the negative (-)
terminal of the battery to be jumped. A spark may cause an
explosion of the gases that surround the battery.
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+ –
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Roadside Emergencies
201