Hi all-

   While trouble shooting my electrical system this weekend, I found I have
   fallen victim to the EC-2's ability to power itself 'backward' via the
   fuel injector control / power lines.  Yes, Tracy does warn about this
   behavior in the installation manual.  And yes, it does drain one's
   battery very effectively.

   His recommended solution is to put on-off switches for both the primary
   and secondary injector pairs.  His logic is this allows one to disable
   an injector pair if it is misbehaving, and at the same time prevent the
   backward EC-2 power phenomenon mentioned above.  I am not a fan of this
   solution - I wired my system with a single switch
   primary-both-secondary.  I figure if I have injector problems, I don't
   want to be flipping a pair of switches trying to find the right
   setting.  There is comfort in knowing I need only flip a single switch
   either up or down to disable which ever pair is not working.

   Which brings me to the title of this email -- namely, what kind of diode
   to use.  I figure putting a diode into the circuit will prevent reverse
   current flow to the EC-2 without forcing me to add or change switches.
   I know there are plenty of EE types in the group, so perhaps someone
   could educate me on how to select an appropriate diode for this
   application.

   Thanks,

   Mark




Where would you put the diode?  Even current flowing through the
injectors is going in the proper direction.  If you put a diode there,
they would not work when you wanted them to.