FORD 2010 Flex v.1 - Manual (Page 322)

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.
Note: Do not attach the negative (-) cable to fuel lines, engine rocker
covers, the intake manifold or electrical components as grounding
points.
WARNING: Do not connect the end of the second cable to the
negative (-) terminal of the battery to be jumped. A spark may
cause an explosion of the gases that surround the battery.
5. Ensure that the cables are clear of fan blades, belts, moving parts of
both engines, or any fuel delivery system parts.
Jump starting
1. Start the engine of the booster vehicle and run the engine at
moderately increased speed.
2. Start the engine of the disabled vehicle.
3. Once the disabled vehicle has been started, run both engines for an
additional three minutes before disconnecting the jumper cables.
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Roadside Emergencies
322
2010 Flex (471)
Owners Guide, 1st Printing
USA (fus)