CB Radio Experts needed!

[cpark_12]

Hey guys and gals,

I need some help with a CB I recently acquired.
I've hooked it up to my truck and when I turn the volume up, I can barely hear anything. I figured it was the speaker, but I hooked up an external speaker and the same thing is happening. Any insight on what's going on?

It's a Cobra 25 LTD WX model CB.

Thanks!