From Booth's Records:

Read, Alvan E.,Jr. 2nd Lt. 2nd Lt. New Co. D, 1st Spec. Battn. (Wheat's) La. Inf. En. June 9, 1861, Camp Moore, La. Roll to Oct. 31. 1861. Present or absent not stated on Rolls. Name appears in column of names Recd. Payment. Roll Nov. and Dec., 1861, Absent, sick. on furlough. List dated Camp Carondelet, near Manassas, Va., Jan. 11, 1862. Roster dated May 12, 1862. Apptd. 2nd Lt., May 27, 1861.

As it relates to his activities with the 7th Tenn, you may wish to go to the Tennessee Board.

I am on an email level with a source that may have more information, will contact and add it as necessary.

JIMT