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Adding a switch in the CB radio's positive lead should work fine. Then if the batteries still run down with the radio power disconnected by that switch, you have more hunting to do. Ham radios usually come with a fuse in the positive lead of their power cable at the very least. If there is a...

It is both normal and recommended in the ham radio world to wire transceivers directly to the battery in order to avoid ground loops and reduce ignition noise in the radio. It is always done with independent positive and negative wires, never using the vehicle chassis as a ground return...