can this be done? switch/relay

link Latching circuits like in the thread above would be needed, with 6 flip flop chips and 12 transistors to cover the 12 channels. 12 mechanical relays would be driven by the transistors, to handle the current you want to control. The outputs from the transistors shown in the diagram need diodes to be added across the relay coils to protect against the voltage spikes when the relays turn off. A cap connected to the reset input from the 12V switched power should make sure everything is off when the car is first turn on. When the car is switched off, all the relays should turn off if the relay coils are powered from the switched power.