Have a 96 ram 3500 v10, after sitting a few hours turn key and nothing comes on, no radio door buzzer lights nothing, and when this happens the radio time is off like aux power is even killed for the clock, bang on dash a few times and everything comes to life, any ideas?

 

Bad ground somewhere. Or bad ignition switch..... Might wanna start with cleaning the battery terminals....

 

Does the truck start or is this just an issue with lights radio etc?