Thank you for the diagram Bill. It would be great if we could do this with a Two pole switch but I think we need Three poles because in addition to the starter and twelve volt lines we also have to connect the two grounds.
I can't find a three pole mil spec switch just the 4 pole switch which is eaton/microswitch 4TL1 - 50 or (MS 27406 -2) so we have a spare pole.
Im not good at diagrams but here is an image. I thought to use terminals 7-8 for earth, 4-5 for battery and 1-2 for the momentary start.
The backup battery switch is also a 4 pole 4TL1 - 3 - a Two position switch.
We would use terminals 7-8 for earth, 10-11 for battery and wire the start power line through contacts 2-3 so in the "on" position the start power battery line is disabled , but the "start" momentary position of the start power switch is still enabled.
Hope this does not confuse the situation but I think this arrangement gives effect to what Rotax say we need without compromising reliability.
Great drawing! I think the wires to terminal 7 and terminal 5 need to be swapped.
SP1-12 needs to go to #7 that connects X3 pins 2 & 3 and the battery.
The grounds on 7 need to go to 5, that then connects the two grounds when the switch is actuated.
If rotax say that start power switch connection between x3 pins 2 and 3 must not be made when using the backup battery then I think an extra pole will be needed on the backup power switch.
Rob, great diagram but FB2 -12 needs to connect to terminal 4 not terminal 8. SP12 - 12 N needs to connect to terminal 8 not terminal 4.
The way it is now, when the switch is activated 12 volts is sent to the ecu ground via pin 4 instead of being connected to the airframe ground. FB pin 2 is grounded via pin 8 instead of being connected to FB pin 3 and 12 volts.
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