69 Valiant Radio Help

There are 4 wires that fall from my Valiant's dash--2 are from the front speaker-green and green/black. The other two are red and orange---from what I read from my earlier post replies--red is power and orange provides light to the unit when the car's headlights are turned on(illumination).

Light to the head unit is provided via the power source. I believe the orange (illumination) wires on newer head units are often for dimming capabilities. For example, you dim your interior dash lights and the stereo lights dim as well. Not all cars would have this capability, so I would think that in many cases this is the wire that would go unused.

Again, if it were me I'd dig around and find the manual online for the head unit to confirm. I'd also check this configuration to see if it works:

RED (dash) - RED (head unit)
ORANGE (dash) - YELLOW (head unit)