Originally Posted by Sinitro
A crucial point is the tolerance of DC voltage measuring device...
For example, a precision Fluke multi-meter has a tolerance of +/- 0.5%..
But a typical automotive DC voltage gauge has a much wider tolerance up to +/- 5.0%.. or up to a 10% window.....

Just my $0.02... wink


It is certainly true of the AutoMeter voltage gauge I have. Compared to my work Fluke, which is regularly calibrated, it's way off.