An alternative scenarion
Just a thought - should the radio have pre-sets on it that it loses?
I suspect that the radio installer has taken a feed from the clock's fuse and swapped the clock feed to an ignition- or accessory-live circuit.
Most radios have two 12v + supplies - one from a permanently-live feed such as the clock and the other from a controlled (accessory or ignition) feed. I'd look at the fuseholder cover to see which fuse the clock is supposed to use and trace the wiring from the clock back to the fuse it's currently fed from then reconnnect it to the correct fuse.
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loki_the_glt - Skipper of the Exxon Valdez, driver of Sweden's finest sporting saloon - and pining for another Slant-4.
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