I am having problems with getting constant power to my head unit, there does not seem to be any wire, with power, coming from the car. I have the yellow wire from the HU hooked with the red ignition wire from the car so that it comes on, but when I turn the key off it loses all its settings. so my question is which wire is the main constant battery wire? could it be missing some how?

 

not sure what color, but if you are looking at the clips in the car, then the constant should be the far left wire on the grey clip

 

is it an aftermarket head unit with an aftermarket wire harness?
if it is the yellow wire on the harness is the constant power for your stereos memory

 

sorry yes it is an aftermarket head unit but no wire harness. there is just a grey plug coming from the car and some speaker wires that may have been where the black plug used to be ( I think the dumbo before me cut the black plug off and spliced everything.) but I will check the far left clip thanks

 

black clip is only the speaker wires, grey clip has the negative wires for the front speaker and the power wires