Lincoln LS 2002 Owner's Manual page 200

3. Connect the negative (-) cable to the negative (-) terminal of the
assisting battery.
4. Make the final connection of the negative (-) cable to the spare tire
tie-down stud. (Your vehicle may be equipped with a plastic cap on top
of the tire tie-down stud. This cap must be removed prior to attaching
the cable to the stud.)
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.
Roadside Emergencies
199