I've read a lot of the post on interference and specifically to use of the Ultrex. I recently installed my 360 and when the Ultrex is engaged my screen is completely washed out. It doesn't matter what speed the ultrex is on. I checked the fuse in the head of the ultrex and it looks good. However I know that the visual inspection isn't always the best way to do it. Can someone tell me how I can use a meter to check this? Thanks.