FORD 2015 Fiesta - Manual (Page 164)

2. Remove the jumper cable on the
negative (-) terminal of the booster
vehicle's battery.
3. Remove the jumper cable from the
positive (+) terminal of the booster
vehicle's battery.
4. Remove the jumper cable from the
positive (+) terminal of the disabled
vehicle's battery.
After the disabled vehicle has been started
and the jumper cables removed, allow it
to idle for several minutes so the battery
can recharge.
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Fiesta (CCT), enUSA, Second Printing
Roadside Emergencies