One possibility is a false door ajar warning - not uncommon with Windstars.
See "Related Questions" below for much more about fixing these
the first will be check for a blown fuse at headlamps fuse box
On a 1997 Ford Windstar : The jack is supposed to be in the cargo area , behind a removable panel on the passenger side
It can not be disabled.
In the museum.
The circuit breaker for the headlights is built into the headlight switch.
A recycle bin.
The replacement number for a 1997 is 9007, I'm not sure what the number is on the 1999, but feel pretty sure it is the same.
Bad ground or alternator stating to go bad.
The Windstar was redesigned in 1999 - don't plan on it fittingCheck with a local auto glass shop - I'm sure they'll offer the definitive answer
No - not at all similar
yes you can
Someone with a service manual should chime in, it will be in there.