well signal lights mostly- I have started trying to sort out the light problems on this old 61 GMC 1000 pickup. it has long ago lost it's original turn signal parts in the steering column and has a signal stat 900 unit clamped to the column. and at one time it no doubt worked. at this time all I have working on the back end is one stop light on the left. I don't know if they have an internal flasher built in or utilize the one mounted on the fuse panel. anyway I did find some nasty looking splices under the seat where the harness goes through the floorboard toward the back and maybe my worst problems are there. it's a place to start checking tomorrow. I mainly wondered if anybody has information on the proper hookup of that signal stat. Raymond- Texas panhandle