FORD 2001 F-550 v.1 - Manual (Page 183)

2. Connect the other end of the positive (+) cable to the positive (+)
terminal of the assisting battery.
3. Connect the negative (-) cable to the negative (-) terminal of the
assisting battery.
4. Make the final connection of the negative (-) cable to an exposed
metal part of the stalled vehicle’s engine, away from the battery and the
carburetor/fuel injection system. Do not use fuel lines, engine rocker
covers or the intake manifold as grounding points.
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Roadside emergencies
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