GM> I think Silicon Chip magazine had something a year or so back.
GM> From memory they used a chopper to dim the lights in the daytime
GM> mode. The advantage is that the circuit can be added in parallel
GM> with the normal headlight switch, and doesn't interfere with it
GM> or the flash switch.
GM> 
Actually, what I am looking for is a schematic that will remain off until
the input voltage is ABOVE 13 volts.  Once that is achieved, I can easily
design and build the remainder of the system.  A car's regular battery will
remain at less than 12.7 volts until the alternator is turned on which then
charges the battery at about 13.8+ volts.

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