okay dokey, you are quite correct in your last reply in that ready and waiting...
Essentially i want a button, SPST, Push to make switch, 1st time i press it, the signal (+ or - no issue with either 12v or less) goes to the first device, a relay probably and holds that relay closed for the duration of the button press. The second press of the switch does exactly the same but to the second device, also probably a relay and at no point should that second press go to the first device and visa versa.
Then it should reset and start again, waiting for 1st press
Thanks so far for your assistance.