We have a 2002 Pierce 100' platform aerial with a Dash chassis. Periodically but more frequent lately, a 5 amp fuse located on the turntable keeps "blowing". There's really no one thing that we do, or at least that we can think of, that causes this to happen. We've been in contact with Pierce and they're no help. Any ideas on what's causing this and what to do about it would be appreciated.