Hi,
So that reading was my car that is sadly sitting in winter hibernation and surely the battery is low. I bought one of these based on Chuck's post, but bought the one with 3 outlets. Attached is a picture with reading of 10.8 with the engine off - this largely confirms Chuck's reading on my car. The next picture is with the engine on, reading 13.9. So my guess is the output is accurate. I also tested the outlets and it puts out 5.2 amps.
Completely unrelated, the last picture is of my car with the left rear running light equpped with an LED and the right light equipped with the standard bulb. Wow! I am sure others have already converted over but I am slow to this kind of stuff. Off to get more of these LED's. The interesting thing is these also work for the brake lights so I am going to use these for brakes until my others come in.
Best,
Tom