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Obvioiusly red is neg and black is pos
You only need 2 DPDT relays...One channel of your RF board triggers one relay. The relay pins are wired like this: the middle pins go to the motor and the NO pins go to the battery. The second channel triggers the second relay, with the motor pins connected like on the first relay, but the battery leads are reversed.Make sure you don't press both buttons at the same time on the remote!!! You will short the batteries!
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