The blowing fuse can not be ignored. Confirm if the fuse is in the engine bay (F1=BJB) or the driver's kick panel (F2=CJB). No sense is going any further with any other suggestions. Focus on the blowing fuse. Will need to know which fuse is blowing. note, If it turns out to be F2.8, in all likely hood this will be a wiring fault in the O2 heaters. Also, since this car has been setting up, any rodent activity? Fuse diagram attached. BJB=F1=Battery Junction Box diagram-11-1 (attached) CJB=F2=Central Junction Box diagram-11-3 http://www.stangnet.com/mustang-forums/801717-99-gt-cruise-install.html OBTW, I reached out to the admin and requested the thread to be moved where more "eyes" can see it. Thanks admin!