In the mid-1950's my father ran one of the best independent auto shops in Nashville Tennessee. He was approached by a local battery manufacturer to develop an installation kit that would allow the guy's 8 volt batteries to work properly in 6V vehicles. By using resistors in several key circuits to control the excess current produced by resetting the voltage regulator, Dad was able to come up with a system that worked. The parts and labor cost was prohibitive, however, and the idea never got past the planning stages, mostly because the battery guy was not willing to accept the extra cost of selling a system that worked properly.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!