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I may be incorrect, but I believe that you do not need diodes with the BLUE Spike relays. They are an "H" bridge device that when in the off position, places both output terminals at negative (ground) potential. If your loads are both connected to the negative return you don't need diodes to control current direction because one load will be between positive and negative and the other will be between negative and negative (no difference in potential, no current).
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