Normally a black is the earth and the red is a live, but if it is the main feed it sounds like one would be the main and one would be a memory, if that is the case you wire up the memory to the leisure battery as the other would only work when the ignition is on but make sure there is a fuse in the memory feed there to break the circuit. I'd imagine their is another earth somewhere
If you wanted to souly run it off the other battery yes you could wire it directly to it but again make sure there is a fuse in their and remember to turn the radio off as youd be able to use it with out the keys in the igntion.
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