Lincoln Electric MKZ 2010 Owner's Manual page 250

Roadside Emergencies
Connecting the jumper cables
1. Connect the positive (+) jumper cable to the positive (+) terminal of
the discharged battery.
Note: In the illustrations, lightning bolts are used to designate the
assisting (boosting) battery.
2. Connect the other end of the positive (+) cable to the positive (+)
terminal of the assisting battery.
249
2010 MKZ (378)
Owners Guide, 3rd Printing
USA (fus)