need some help on my first jeep/jeep build ever. got a few issues that i cannot seem to figure out. anyone willing to give a hand to a new member to the jeep world let me know. the issue at hand is that i replaced the 2.5l motor with a used one. has 36,000 miles on the motor. re-wired everything and it ran for 2 days with out an issue. now the battery is dead, alternator wont charge it, yesterday jump started the jeep ran for 10 minutes then was bogging down and wanted to shut off. and help is greatly appreciated.