Isn't 20 amps excessive? I mean, the entire engine should run off 20 amps, not just one pair of coils...
 
Dave

James Maher wrote:

Dave,
I use this switch with Tracy's EC-2 controller.
The coil disable inputs are wired to this switch and function when controller "B" is selected.
I also have 2 separate 20A breakers ( the push/pull type) that the coils and injector pairs get their power from so that they can be disabled when working on the engine.
Jim Maher

*/David Staten <Dastaten@earthlink.net>/* wrote:

    Another "fishing trip" to ping the collective masses here.
         A little background:
    Typical "aircraft" key ignition switches for controlling magnetos
    operate by grounding out the mag to "disable" it. The commonly
    seen configuation is something that has OFF, L, R, BOTH and a
    START position.. On the L setting for Left Magneto, the right mag
    is actually grounded/disabled and vice versa for the R position.
    In addition, in some installations, the switch also disables the
    right mag for starting if the aircraft has a "retarded" mag on
    the left side.
         I am curious about the following switch:
    http://www.aircraftspruce.com/catalog/elpages/ignitionswitchkit.php

    http://www.aircraftspruce.com/catalog/elpages/ignitionswitchkit.php

    Wiring diagrams available at the link.

                     I am wondering if anyone has hands on experience with these sorts
    of switches (from a wiring standpoint..

    Does anyone know if this switch is reasonably/easily adaptable to
    selecting individual coil banks such as for "trailing" and
    "leading" when used in conjunction with an EC 2 setup?
         Is the ground terminal on this switch connected to the entire
    switch chassis or is it an isolated terminal ONLY used for
    grounding the mags (and if its isolated, could it safely be used
    as a low current "HOT" instead to power a coil relay? Or are
    there relays (which in turn control the coil packs) that can be
    reasonably set to open/disconnect when placed to ground? Or would
    having a relay with a ground trigger result in undesireable
    current flow through the switch or relay? I assume an Ignition
    Master switch to de-energize the whole thing would be needed in
    that case
         If useable, the implications would be great: A key switch for
    "security appearance" (A.K.A.. the New Jersey dual lock rule).
    Key-cycled control of both coils, AND a start switch all in one.
         The only DISADVANTAGE that I see is the difficulty in cranking
    the engine with the ignition OFF for whatever reason: preoiling,
    clearing a flood, priming etc. I would assume that the COILS
    circuit breaker would need to be pulled in that event.
         Dave