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Alright, so I've taken your feedback and I think I've fixed things.
1. I moved the switch to the ground side. This is just for reference, since this is meant to represent how the car comes from the factory, but best to have it as accurate as possible.
2. I swapped my momentary SPST switch for a momentary DPDT switch. This allows me to wire it to the relay so that I can send +12V of current one way or the other, which will energize the coil in one direction or the other, thereby flipping the relay one direction or the other. I want to use a latching relay that remains in whatever position it was last energized in (in other words, a spring-loaded relay that only requires power to change position.
Does this seem closer to what I want? I realize the wiring is a bit confusing at first, but I think it all makes sense now.
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