Help! Wiring diagram for old Alpine 3024

I just obtained an old Alpine 3024 Eq/ Amp just to throw in my old van but I cannot make head nor tail of the wiring. Does anyone have a wiring diagram? Thanks, It would be much appreciated

I called Alpine and got redirected to a local store where a young sales assistant had no idea at all. He just said get a new amp etc but I don't want a big steel box in my little van (not to mention the cost)
If anybody can figure these colours out that would be great

side a: red, dark grey, light grey, green

side b: red, white, blue, orange, dark grey, light grey, green and a thicker black wire (I assume that would be ground)

Thanks in advance