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I added a relay yesterday and feel much better about it being wired that way. I use the temp controller box as the signal to turn the relay on so it still controls the fans just doesn't run all the current through it. I also ran the grounds on the fans to a separate spot instead of to the controller. I still need to figure out why one of the fans has never been as strong as the other. If you need help I can explain how to wire in a relay, its super simple and will save you lots of headaches. Really each fan should have their own relay.
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