To circumvent an unidentified battery drain on my v6 Contemporary I bought an isolator. This has proved to be most effective in preventing flat-battery-dom. However the v6 has the battery in an easily accessible engine-bay location. Having already enjoyed an anticipated dead battery in my very newly acquired v8 I wonder if there is a way of incorporating an isolator. Attached to the battery would not pose an insurmountable problem, merely inconvenient and physically taxing. Could an isolating switch be put on the power supply line somewhere more readily available? What is the red wire running to the engine-bay fuse box? Is that the primary distribution point or does the wiring separate into different circuits elsewhere. If the v8 electrical drain is from one of the circuits running out of the passenger footwell fuse box is there a single supply wire that could be isolated? No prizes for noticing I am no automobile electrician.