hey tankwagon,

could you be a bit more specific

were all three codes(21,22,23) showing up together at the same time, or would they come up individually? and how often were these codes appearing?

the voltage regulator that you are referring to , is it the one located on the back of the alternator, or is there another one of these VR's located elsewhere?

could you please provide the testing procedure, and any other useful details?

thanks