Last night I purchased a Dean Markley Promag Grand acoustic humbucker for my acoustic guitar. However, when I place the humbucker into my acoustic and turn my amp on, I can't get any sound to come from my amp; it's as though nothing's being played on the guitar. Any help would be greatly appreciated; by the way, I'm using a Marshall Mode Four halfstack, if that helps.

EDIT: Shit, I meant for this to go in the Musicians Forum; sorry about that. D'oh!