"Greg O" wrote in message
...

"Tony Hwang" wrote in message
news:GM0ze.1878860$6l.1767733@pd7tw2no...

Hi,
Or if the current draw of the radio is know, installing drop resistor of
correct value and Wattage. Calculate with Ohm's law.
Tony

That will not work because a load like a radio is variable.
But it probably does run off 12 volt batteries, so like the first guy
said, just hook it up to one of them.
Greg


If he couldn't tap into a 12V source, a simple voltage divider and a fuse
should work .