Apologies in advance because I know this is probably a dead horse but, have a new-to-me 67 C that will not crank when the ignition switch is pushed in and all the way to the right. Almost got stranded on a cross country, had a mechanic come out after hours and he got it to crank on the first try. Got the plane home and it’s back to no cranking (cold start). I can hear the buzz and the click of what I imagine is the starter solenoid? Battery is a brand new Concorde and I have checked cleaned the wires/leads from the battery to the starter solenoid/starter. Please correct me if I’m wrong but the buzz/click would indicate the ignition switch is working, but something is busted downstream of that. Any ideas on what to check next would be greatly appreciated. Thank you.