Ford Ranger Owner's Manual page 18

Charging System Light
This light indicates that your battery is not being charged and
that you need to have the electrical system checked.
Charging system light symbol
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.
Check Gage Light (If equipped)
This light will come on when the key is in the ON position and
the:
engine coolant temperature is high
engine oil pressure is low
fuel level is near empty
This light serves as a notice that a system needs your attention
and to check the engine coolant temperature gauge, the engine
oil pressure gauge, and the fuel level gauge.
Instrumentation
15