car Radio , in some car in Africa. ? 100% dead. I presume.
fuses are first , both main power feed fuses and any found at read of radio. blown.
a typical radio has 3 power feeds.
only one must work to turn on,
Main power 12vdc and
ground wire. (takes 2 connections)
memory power (stores selected stations)
and antenna power.(elect antenna, up down motor)
dial lamp power, for back ground glowing, wired to cars lamp dimmer.
the radio can be bench tested with any 12vdc power source, a battery 12vd or power supply called 12vdc.
causes
fuses blown.
wired wrong , installed wrong.
radio ground missing, to car body.metal
radio is dead, buy new one, fixing old costs more.
r250 sold here
https://evolutionwheelandtyre.com/collections/best-selling-collection/products/harwa-car-radio-w-bluetooth-1045ly
buy new one, and get the manual
google finds no manuals for this radio.