Ford 1998 Windstar Owner's Manual page 17

Instrumentation
Under certain conditions, the Service Engine Soon Light may
come on if the fuel cap is not properly installed. If the Service
Engine Soon Light comes on and you suspect that the fuel cap
is not properly installed, pull off the road as soon as it is safely
possible and turn off the engine. Remove and replace the cap,
making sure it is properly seated.
After completing the three consecutive warm up cycles and on
the fourth engine start up, the Service Engine Soon Warning
Light should turn off. If the light does not go off after the
fourth engine re-start, have your vehicle serviced by your dealer
or a qualified technician.
Charging System Light
This light indicates that your battery is not being charged. The
light illuminates briefly during the display self-test every time
you turn your ignition key to the ON position. The light will go
off when the key is turned to the START position. The light
should stay off when the self-test is done if the engine is
running and the alternator is charging.
If the light stays on or illuminates when the engine is running,
have the electrical system checked as soon as possible.
The charging system light
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