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The diodes should work, but be aware that they will drop ~0.7V or so, so you'll actually get ~11.3V instead of 12V. If the radio is okay with that, and if you can dissipate the heat caused by the diode drop * current drawn (may be small, but must be known), then you're okay. It won't backfeed either source. If you don't want the voltage drop, then you can ...


Looking at the diagrams, it looks like each lock has a motor and a microswitch to tell if it's locked or unlocked - presumably so you can't try and lock it when it's already locked or vice versa, or simply to reverse the polarity. The wire going directly to the motor (red and black) will be common to both. This wire will be positive for one action and ...

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