Instrument panel fuse keeps popping?

I have a 1997 Ford F150 and the instrument panel cluster fuse keeps blowing out. It started happening after I took my muffler off but I did put a new one on. I have replaced the fuse twice already in the past 4 days. Does anyone know what's wrong.

Are you talking the small box under the dash board or the larger fuse/relay box under the hood? In the small box under the driver's dash, Ford does not 'usually' have a dash board fuse. In the box under the hood, the dash is on the same fuse as a lot of other interior circuits.