k here is what we have:

(im not a phone guy btw [Linked Image from sundance-communications.com] )

teh system a kx-td1232
it has:
a 4co
and 2 8EXT on it now.

the bottom 8ext doesnt even give battery. we swaped it with the top one and we know it works fine. but as soon as its pluged into the bottom slot, it give 0. in fact anything pluged into the bottom one gives notihing. is it possible that there is a "fuse" gone on the system ?