S12S, cruise control switch and power

[pn_day]

Hi all
My S12S sine wave controller with cruise control is working with a momentary switch to engage the cruise (as long as throttle is above 7 mph).

However, the switch that I am using (for a horn) also has an on/off switch that I want to use for some 12V lights. Unfortunately the 2 switches have 3 connections between them (common live and 2 switched outputs I'm guessing)

Horn red/green
Lights red/yellow

My question is whether I can use the lights on 12v (ie send 12v on either red or yellow, return to lights on the other) and still use the horn switch to engage cruise. My worry is that I think if lights are active, ie 12v on red and yellow, then when horn button is pressed 12v will also be present on the cruise input to the S12S (red/green) which might let the magic smoke out.
Thanks in hope
Phil

 

[Alan Quay]

If the switch is anything like the one I have, take it apart and you can unsolder the common, giving two independent switches. You still cant control three things sperately though....

 

[Deleted member 4366]

You need to keep the cruise wires absolutely separate. They carry 5v or less and are connected to the CPU, so if any 12v touches them, you'll need a new controller. As mike says, you should be able to separate the common link, then use the switch to switch the positive light wire, and send the negative direct from the source to the light.

 

[pn_day]

Thanks chaps. Very creative idea Mike, and thanks d8veh for the detail.