Actually no, but I did have my DMM connected directly to my amplifier, where my rear battery connects directly to the rear battery. And it does in fact shows those voltages. And it's off by maybe 0.1 0.2 from my front. I have notice that when the car has not been started for a few hours/sat for few hours or overnight. When I start it a belt would squeak. After its warmed up it won't do it anymore unless I have the car sitting for few hours. Seems as if the belt loosen a little bit. I am going to try to tighten it more to see if it helps. (After it squeaks and warm up I'd rev to see if it would squeak it does not).