On Tue, 05 Apr 2016 13:48:45 -0700, hrhofmann wrote:

It must be either that the
battery voltage drops under load, or that there is a high resistance
somewhere in the circuit. You get to play Dick Tracy to find it.

Let's just hope for his sake it's not an intermittent fault (as it's
beginning to sound like) - they can make any fault 10x harder to find.