Stereo Wiring - 1989

[Mavrick]

Hey guy's, i need some help with the wiring of my stereo. The previous owner hacked up the GREY connector (dimmer, ground, lights, etc) of my stereo connectors, the black one is fine (speakers).

Here is what i have...

RED - Ground
Yellow w/black stripe - 12v ignition
Orange w/black stripe - Illumination relay
Blue w/red stripe - unknown
Green w/yellow stripe - unkown

One unknown is the dimmer illumination, i was going to put a test light on them and play with the dimmer switch to find that one. That will eliminate the 4/5 wires... but what is the last wire for?

BTW i have a couple diagrams already, but nothing mathces the colour schemes that i have.

 

[Mavrick]

Sorted it all out with a multimeter, woohoo.

 

[cjman15]

i did have a diagram for splicing tha wires for my JVC, but i dont seem to have it anymore... i always thought red was for power and black was a ground...?