[CREWZIN]

Welcome to the forum. Why do you think replacing replacing the solenoid will cure the noise? Here's something form in internet search......

What if there is a grinding sound? This could indicate a flywheel problem, which is totally different. It could also mean that something has broken off the starter and is grinding into it. This could also indicate something wrong with the flywheel or inspection plate. In my most recent problem, there was a horrible grind and pop. Something had jammed my inspection plate into the flywheel, stopping it from turning. In turn, this had snapped the nose off the starter. After pulling the starter, check it for damage that could lead to a more specific diagnosis.

As far as your radio. You didn't say what year your PT was so can't tell you exactly where the fuse is so check your owners manual.