Your suggestion to connect power to both boards worked great.  I did a quick check with an RC power analyzer I have laying around and thought I would post it for you to look at.  Strange thing is, I do not approach 500mA at any point.  There could be a transient current spike < 20ms in duration which may be missed due to the sample frequency.  It seems unlikely if you look at the graph however.





Thanks for the help


Mark Klunder