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Pull power from one battery for the relay coil and it works fine. Relay contacts are isolated from the coil. I use one of those big red square boat switches under the hood for the stereo on my paintball tank.

What I plan on doing is adding a remote controlled relay placed out of sight. Same thought as you except even with a keyed ignition switch unless it is sealed all they need to do to bypass it is short across the terminals. Different story if the security switch is hidden. Just a thought...