Since I am doing this on a car with an already functioning setup, I cannot use that as it isn't legal and thats the whole point.
To be legal, I cannot be able to turn them on/off manually, it must be automatic.
Thanks for the suggestion though.
Might be more complicated than that because the headlights are the "other" light, and your AMDRLs have its own switch.
Probably the simplest solution that allows BOTH lights to be shut off at the same time (instead of using a single norm open/norm closed toggle switch) is install a relay switch in series with the AMDRL switch, which sounds like that you already have another relay right now. Hook up the relay's normally closed contacts in series with the AMDRL switch, and the coil of that relay in parallel to the headlights.
This way when the headlights are turned on normally, the relay will energize, which will cut off power to the AMDRLs. The AMDRLs will still be off when the parking lights are off.
A more cute way of doing this is designing a logic circuit (Turn AMDRLs on iff headlights off and parklight on) but I think the relay solution requires less "cute" circuitry.
This sounds like what I'd need to do, but I don't fully understand it.
To better help you guys understand, I have a relay on the lights but I have no idea how relays work other than the basic function. I wouldn't know how it does what it does.
Current system is this.
Park light switch in car > park lights. Park lights > ground.
Piggybacking the +12v of the park lights a wire runs to a 40amp relay.
A +12v wire with a fuse runs from the battery, to a toggle switch inside the car, then to the relay.
The relay sends +12v to my DRLs when both the switch and parklights are on.
The DRLs then return to ground.
To comply with local law, I need to replace the switch with something that is constantly powered when I turn the ignition on and turns off automatically when the park lights are on. So I'd need to move the relay power source from the park lights, to the battery instead, but thats as far as I have worked out.
I can still turn it on/off via switch, but the turning off function when the parklights come on, must be automatic.
I understand wiring diagrams better than technical terms, so that may work better.
I'll try to create a wiring diagram of my car when I have time.