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The yellow is the ground. Just attach it to something metal in the hood. BTW I didn't ground mine, now every time I reach into to the tank and touch the metal I get shocked like CRAZY!!! Scares the hell out of me
The red is postive and the black is negative (most likley)
If it is DC and you connect them backwards the fan will run backwards. I am not sure if it will do this with an ac connection. (mine didn't)