I left my 2014 street glide ignition switch on and my battery went dead. I tried to jump it with a jump pack with no success. I charged battery all day, checked main 50 amp fuse which is OK. The p&a relay clicks, instrument lights flicker, no voltage reading on dash gauge. Any help would be appreciated

Have you thought of going to a Harley Motorcycle Forum. They are usually pretty good and there is where there is a wealth of information from a lot of guys who have done the same trick. I have a Honda so I don't know if I can help you. Question, you say you charged all day, on the bike or off? The fact that the lights flicker could be an indication that the battery is toast and can't handle the load.

If you don't get an answer here, Google: Harley Motorcycle Forums