Cleaning the contact points, changing the battery, turning off the rear button focus.
Sure you did not switch to manual focus while testing the Tamron? Sure all settings are correct?
If the Tamron still auto focusses on you 7D, check the forums about this. I know Nikon sometimes messes up the firmware, when a non Nikon lens is used, but not on all camera's. And not with every firmware.
I don't know the 7D enough to check more details, but check everything about the AF settings. I can't imagine your lens did something wrong with the camera.
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