I have an old truck which I converted from 6V to 12V nearly 50 years ago. A good friend and electronics wizard put together a regulator for me which reduced the 12V (approximate) voltage to 6V (actually 7.2V no load) with a current output high enough to power the heater motor, wiper motor and gauges simultaneously. I still get 7.2V output with no load but as soon as a load is put on the device output drops to ZERO or slightly above; thus the title. I can send pictures to anyone interested. NOT interested in experimenting with ballast resistors or buying some Chinese *** that won't last another 5 years let alone 50.