i have a problem with my 1978 GMC 1/2 ton truck, i can not get it to turn over. the other day April 15 2020 i starter up my truck and when uptown, started up again to go to post office, started it up again to go home, starter it up again to load to go to recycle bin for paper, then when home again

later in afternoon i what to start truck up again but it would not turn over, but at that time i did have radio and signal light. but next morning when i tried again none of the above worked, but head light worked, it should it a new battery a little more then 4 mos old ( tested it and it OK )

remove the key lock ignition switch from steering col, and one thin i did notice the key lock had no spring back, no resistance, of which i replace 2 year a go when it broke apart inside steering col, of which i failed to remove the steel clamp from old one and replace the lock with a new one insdie steering col, now i thin that small part has come back to cause me some grief