The automotive industry today is faced with ever increasing electrical power demands that are stretching the capabilities of present on-board power supplies. The use of electrical and electronic features to enhance customer comfort, convenience and safety, such as electronic automatic climate control, entertainment systems, antilock brakes (ABS) and traction control (TC) systems, contribute to exponential growth in power demand and also to size and complexity of the wiring harnesses as well. The substantial range of options available for dealing with emergency aid in dual voltage vehicles is discussed. These options differ in both cost of implementation and relative freedom from failure modes and hazards. The choice will be complex. The decision on which approach to use will likely vary among auto manufacturers. What is critical is not that all manufacturers have exactly the same implementation, but that there is an agreement on the approaches that are taken, and that those varied approaches are compatible once these systems are in the hand of the public. It will be required that all manufacturers use the same connection for the new 36V batteries.
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