Check the cigarette lighter. If it works then most likely there is power to the radio.
It isn't certain. Only and indicator.
Voltage tester?? You mean a multi-meter??
They are cheap at radio shack or harbor frieght
From the wiring diagram, there are two wires with power
One from the battery, hot all the time, to keep radio stations and programs set
Second from the ignition, hot when in accessory or run
The radio seems to have an internal fuse.
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