[wiswind]

I am not at all familiar with the security system.
Do you have the owner's manual?
I do NOT recall the flashers flashing when I reconnected my battery.....(that is with them turned off)....but I do not have a security system.

Try posting the year of your windstar.....
I am assuming that you are talking about the factory security system?

Also, try doing a search in this forum on "security"...or other key words....like "won't start"..
I am sure that someone who has the security system has been through this.
Having the battery disconnected for as long as you did.....would certainly have cleared the computer. So the steps of disconnecting the battery, with the headlights on.....and waiting 5 minutes before reconnecting.......would be the same. (your underhood light would have drained anything that the headlights would have in your work time...unless you are a lot faster at the power steering pump change than I am).

Also, look around for anything that you may have forgotten to connect.....like the alternator.....a plug....and a wire.