If you look at the chassis of the radio where all the components are mounted, you will see round cylinder shaped objects, usually yellow in color and covered in wax. These are the paper capacitors. There are also some other types but I can talk about them later. If you get a circuit of the radio, each of these capacitors is listed in the parts list, the circuit diagram shows where they are connected and usually there is a diagram of where they are on the chassis. These are usually replaced because they dry out and short. Quite a few members here have successfully done this work on thier truck radio. We have walked some of them through the process and helped when they are stuck.
I buy my capacitors from a place on the net called "just capacitors". The rest of my parts I usually get from Antique electronic Supply. If you want to give it a go, I would be glad to help you out, on the site here.
