Ginge, as both of your relays are operated from a single switch, why did you decide to use two
SPDT relays instead of just one
DPDT relay?
If anyone was considering a similar setup, but didn't want to go to the trouble of a hidden reed switches and magnets, they could easily mount a miniature
DPDT toggle switch somewhere easily accessible
(but out of sight) instead.
![](http://www.domustools.co.uk/Globiz/globiz%20tools%20pictures/09030-0.jpg)
Miniature DPDT Relay Miniature DPDT Toggle Switch
![](http://goldenmotor.com/SMF/index.php?action=dlattach;topic=2869.0;attach=4017;image)
Regarding the above pair of 10K and 2K resistors in series on the throttle 5V feed, is the 1V supply a result of the voltage drop through both resistors as you've shown
(the same as it would through a single 12K resistor), or does it come from between the two resistors
(with the 2K going to ground) like the simple voltage divider circuit below?
![](http://upload.wikimedia.org/wikipedia/commons/d/db/Resistive_divider.png)
Vout = 2 / (2+10) x 5V = 0.83V
Alan