Here is an AM radio for the early model Chevrolet. I am sorry, I do not have any loose speakers about. I wanted to test the unit. It does power on with a 12v supply. The best I could do, I had a 12v piezo, and I hooked it to the speaker wires. It does chirp, so that's as close as I can get you, as far as doing a test for functionality. I'm assuming that the speaker wires are sending a signal, or the piezo would have been silent. 

All controls move freely. The indicator bar moves smoothly, and pilot light comes on for the face of the radio. Please look at pics. This unit will need a cleaning. Probably will look pretty sharp once a little time is spent on detailing.

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