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- 2018 CX-5 Sport
I used the rear accessory power supply, and then changed the 20amp fuse (it might have been 25 amps I forget) in the fuse box to 10amps since that's what the harness used. I don't use accessories that need very many amps especially in the back. If you get the Canadian Mazda harness, they supply a wire terminal that plugs directly into the wire box in the back of the car for power.