I bought one of those custom humount radio mounts for my 94 z28. I basically have a black wire for ground and a red wire for power to attach. I wanted to have my humount led lights to turn on/off with the radio - Does anyone know what color wire I need to attach that to behind the reciever???

 

black to ground, hook the red wire to the accessory wire if u want it on and off with car, or the remote wire from radio so it goes on and off with radio

 

I wouldn't connect it to the remote turn on lead from the HU. Use the power wire to the HU that is "switched" to power your trim ring instead.