Ford Mustang Owner's Manual page 18

The low coolant warning light
Charging System Light
This light indicates that your battery is not being
charged and that you need to have the electrical
system checked.
The charging system light
This light illuminates every time you turn the
ignition to the ON or START position (engine
off). The light should go off when the engine
starts and the alternator begins to charge.
If the light stays on or illuminates when the
engine is running, have the electrical system
checked as soon as possible.
Overdrive Off Indicator (Automatic Only)
The overdrive off indicator light
15