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timered 12v Fan


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Hi, could someone tell me how to make a 12v timer. its for my  race car, i want it so it turns on the Thermo fans after 5mins of the ignition turning on from the +12v signal. the fans are relayed so i just want to put this inbetween,. is it also possible to add a button that when you press it, it turns off the timer till ignition is off and resets its self (incase the engine is started hot and doesent need the warm up period)


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