Sounds like the alternator is not capable of supplying the load for the system. Typically the systems that test the alternators test the voltage output, not the current capabilities.
Make sure ALL of your terminals are shiny clean before you re-install any of them.
My 5.2L Build thread
-1989 Jeep Wrangler 2.5L, soon to be 5.2L
-1996 Jeep Grand Cherokar 5.2L, donor and rainy day driver
-2004 Kawasaki KLR650 sunny day driver
Originally Posted by mudsweatNgearz
Leave em off and weld an I beam on. Bumperetts just scream homo.
"A well regulated Militia, being necessary to the security of a free State, the RIGHT
of the people to keep and bear Arms, SHALL NOT BE INFRINGED