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Okay so I have done some digging around and it seems that HC stands for high current. I'm figuring that those two relays must have something to do with the fans speed and so only open when the fan must spin faster as they can allow up to 120A based upon the rating from what I have read. I'm still unsure of what the "U" relay does for the cooling fan. There is also two general "micro relays" and then there is the matter of the K1, K2, K3, and K7 delineations as well. So figuring in i want to prevent the fan from coming on at all I would want to target the relay that controls the lowest fan speed. Now I just need to figure out which one of them controls it right?
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