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
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Maybe I don't understand where you intend to put the diode, but I don't
think it is a "reverse" current; but rather is in the same direction as the
normal power to the injectors.  So a diode may not be your solution.

Al

This is your typical injector driver circuit adapted from a Megasquirt
schematic. The possible position of the diode is shown.
The current is several amps peak so chose a diode that can handle it.