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It can be done , you turn the battery around & flash a live current onto one of the terminals on the voltage regulator to repolorise that. It'd be helpful if I could remember which one. Beware though that all your switches will then be on the negative side of the load & it will be very easy to short things out if you are not careful. Also the radio won't work without reversing the wiring , it'll still need a positive earth.
