Ford Mustang Owner's Manual page 201

3. Connect one end of the second cable to the
negative ( ) terminal of the booster battery
— NOT to the discharged battery.
4. Connect the other end of that cable to a
good metallic surface on the engine or frame
of the disabled vehicle making sure it is
clear of any rotating engine components. The
following illustrations show where you can
find a metallic surface.
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.
WARNING
203