just got my 93 blazer back from having trans work done, before then it started great Now I have to jump it every morning. When it's running it show 15/16 on the gauge? Any ideas? Help

 

What did it show before? Should be no more than 14.8 using a DVM at battery terminals
Have both the battery and the alternator tested.
If you want to see if the alt is discharging it,
key off
disc neg batt terminal. remove wires at alt, keeping them away from metal. Reconnect neg at battery and touch wires to their posts one at a time.
If sparks at all suspect alt.