In that case I'd use suitably rated wires to link the high current components and only use PCB/plugboard/breadboard for the low current parts. The currents and voltages you're dealing with are well within the normal range of automotive wiring.
In that case I'd use suitably rated wires to link the high current components and only use PCB/plugboard/breadboard for the low current parts. The currents and voltages you're dealing with are well within the normal range of automotive wiring.