I've got a cool little Aria Pro II CSB-300 from the '80s that I really like. I just switched from flatwound to roundwound strings, but when I went to plug in, the pickup is putting out
very very little sound!

If I tap on the magnets, they all are putting out a little signal, though the 2 for the higher strings are a little stronger than those of the fattest two. I popped the cover and even pulled the pup and all seems well connected. What could be the issue? bad pot maybe? Any help would be appreciated mucho!