Question about Magnum 257 CB Radio

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No power to radio in trk have 13.5 volts to radio 257 magnum

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I believe you are saying there is power to radio from truck but radio does not power on. I am not familiar with the this radio in particular. However i would assume there is a protection diode. That if polarity(-/+) is reversed it will cause a direct ground and burn the diode saving the radio. This in turn blows your fuse in power cord. This is now a direct ground continuing to blow fuses even if you power leads are correctly connected. This diode must be replaced or cut if it is cut and not replaced the protection is gone.

Posted on Jan 21, 2012

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Ensure that the wiring is correct. Also make sure that the CB's AC is still functioning correctly. Charge your truck's batteries and test the CB on a fixed electrical output (indoor outlet). Also check to see if the power cord is the correct wattage output for the radio.

Hope this helps!
Gavin93

Posted on Aug 07, 2008

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