Several of the accessories are switched at the device or somewhere other than on the instrument panel. I created a separate bus to handle these loads: right USB port (3a) left USB port (3a) right seat heater (5a) left seat heater (5a) cabin heat blower (3a) defrost blower (7.5a) I had just finished the radio stack and immediately put the sub bus on the side of the radio stack, and moved the ground out from under the radio stack. The new look is easier to service, with the tradeoff that removing the radio stack now requires disconnecting that cabin accessories bus.