Radio not working

Sounds like you are talking about a simple old AM only radio. Details would be helpful.

If that is what you have, then ALL you have is three wires and a case ground

1 fused power to the radio

2 lamp connection to the dial lamp

4 speaker out

This is simple. Ground the case, connect the power wire, and a speaker, even one off your computer and try it. Don't forget some sort of antenna

There should NOT be power (DC 12V) on the speaker wire, and do NOT run power to it.

If it won't work, it's time to either look for a replacement, or find someone who "knows electronics" that wants to fix it.

If there's no "thump" in the speaker when you turn it on, it might be something simple like the output transistor