Mercury 2009 Mountaineer Owner's Manual page 317

Roadside Emergencies
Removing the jumper cables
Remove the jumper cables in the reverse order that they were
connected.
1. Remove the jumper cable from the ground metal surface.
2. Remove the jumper cable on the negative (-) connection of the
booster vehicle's battery.
3. Remove the jumper cable from the positive (+) terminal of the booster
vehicle's battery.
317
2009 Mountaineer (mnt)
Owners Guide, 2nd Printing
USA (fus)