I realize this is an old thread, but I have the identical problem with my 74 Duster 360. Starts great when cold, but after a 5-10 minute ride, if you shut it off, nothing happens with the starter when you turn the key. Let it fully cool down for 35-35 minutes. All dash lights/acc come on like they are supposed to when you turn the key and the car is hot, there is just "silence" when you try to start it. Have done the following: New mini-starter w heat wrap(same thing happened with an older factory style starter); new optima battery, new starter relay. Battery is trunk mounted and I have checked positive cable from the trunk to the starter. THX for any ideas...
