1989 240 automatic trans -- first overdrive light came on -- checked fuse -- it was bad -- replaced it - cured -- 2 minutes later -- fuse burns out again - decided to try it again -- cured --- weeks go by -- overdrive light on again -- now fuse is fine -- but changed it anyway --- still light is on -- before i pull the radio out in search of the relay -- any other choices -- ?

detail -- I never pushed the selector switch -- the light just came on and it went into 3rd gear -- will not come out --

thanks --- andy