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I don't know what the specs are for that one.
Honestly, I'd just order one from the link I put up. I have placed several orders with them and I am always impressed with their rapid delivery and low prices.
Mine did the same thing. I had an extra toggle switch with me, so I put it between the brake light input to the controller. Now, on a hill, I reach down and turn it off if I need the 4 ways.
A diode is the correct fix.