It's a shame when a pickup truck has to deal with recreational vehicle cycling batteries and the ECU could care less. But the ECU does not permit direct substitution. Something needs to go into the A field circuit feed to the ECU to satisfy it enough not to go into open-loop limp-home mode. Has anyone done any research on this and pray tell, developed a work-around to allow a "smarter" voltage regulator to be employed? -Thanks!