FORD 2010 E-450 v.3 - Manual (Page 251)

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.
Note: In the illustrations, lightning bolts are used to designate the
assisting (boosting) battery.
2. Remove the jumper cable on the negative (-) connection of the
booster vehicle’s battery.
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Roadside Emergencies
251
2010 Econoline (eco)
Owners Guide, 3rd Printing
USA (fus)