I am working on a custom automative install on my car. I have a few lighting fixtures that change colour based on which power +12v wire is being used.
For example, each lighting fixture can display a purple light, or a white light. To switch between the colour options, the +12v wire connected to the power source must be changed. The red wire gives me a purple light, and the yellow wire gives me a white light.
I want to use a switch panel for individually turning each fixture on and off, but a separate switch for changing the colour of all fixtures as a whole. What is the best way of doing this?
If the devices only had one colour option, I could build a simple relay panel for each device into my fuse box, but I do not understand how to achieve something similar to this with devices that use multiple +12v power wires to change their operating modes.
Any help is much appreciated.