ok take alot of pics just incase..i looked could not find any schematics. But there are vintage guys that might have 1 .its hitting as many sites as you can.might be 1 might be 10.000 later gl.
only thing to do is get a schematic for that radio. pull battery out. separate 2 half's of radio then track do wiring from battery posts to power on switch. could be many different issues from broken wire to bad switch or contacts.