Where do I find a user manual for a Timex Expedition (H2Y518)? I had Timex install a new battery and although the date 3-17 is correct, the day of the week is SUN. I have tried changing the date for over an hour and can only adjust the month and day. I see nothing allowing me to change the day of the week.

You are very observant! Timex watches don't have a way to adjust the day.
However, if you turn the hands clockwise you will see the day advance.
So, heres the secret, follow exactly:
1. Turn the hands until the day of the week shows the day before. If today is Wednesday then turn the hands until the watch shows Tuesday
2 Adjust the date to the day before. If today is the 17th then adjust it to the 16th
3. Now pull the crown all the out and and advance the hands until the date changes to the correct date, 17 in this example. This happens at midnight. Continue the movement in a clockwise direction for a few more hours and you should see the day change to the correct day.
4. Now continue to move in a clockwise direction until you have the current time. Remember that your date/day changed at midnight so if the current time is after lunch(noon) you must continue past noon to get to the correct time. If you don't do this correctly your date will change every day at noon instead of midnight.
If you don't succeed the first time, try, try again! Good luck, Michael, Watchmaker to the Stars!