[blucar]

When I installed sealed beam head lights in my '36 in 1952 I installed a GM type of a relay in the circuit that supplied power to the head/tail lights, the only things that get power from the original '40 ignition switch in my car is the ignition and heater. The radio is still wired directly to a hot terminal that is not switched other than the switch within the radio..
Learned a long time ago that if the radio is wired through the ignition switch, and the switch does not have an accessory side, if you want to play the radio without the engine running, the points will burn up.. Been there done that, fortunately I had a finger nail file to clean up the points and get the car going.