Ford 2003 Mustang Owner's Manual page 136

Roadside emergencies
not touch. Set the parking brake on both vehicles
and stay clear of the engine cooling fan and other
moving parts.
4. Check all battery terminals and remove any
excessive corrosion before you attach the battery
cables. Ensure that vent caps are tight and level.
5. Turn the heater fan on in both vehicles to protect
any electrical surges. Turn all other accessories off.
Connecting the jumper cables, 3.0L Vulcan, 3.0L
Duratec and 3.4L SHO engines
1. Connect the positive (+) booster cable to the
positive (+) terminal of the discharged battery.
Note: In the illustrations, lightning bolts are used
to designate the assisting (boosting) battery.
2. Connect the other end of the positive (+) cable to
the positive (+) terminal of the assisting battery.
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