ok is there any universal wire colors that can help me figure out what wire is which?

so far i have figured out which are my front 2 speaker wires by removing the speakers, and the same for the rear 2, but everything else has me stumped since they disappear into the dash and out of sight so i cant trace them (also i cant fit under the dash!)

the unit im replacing is the old Clarion PT-9614 it has 2 connections at the back one large and one smaller one

Large connector:

1 white wire - red bands(?)
1 blue wire - white stripe with red bands(?)
1 blue wire - red stripe with red bands(?)
1 red wire black bands(?)
1 blue wire - purple stripe (right speaker)
1 blue wire - yellow stripe (right speaker)
1 blue wire - white stripe (left speaker)

small connector: (starts pouring rain only managed to trace right rear speaker wires!)

Black wire - white stripe with red bands (left rear speaker?)
black wire - yellow stripe with red bands (left rear speaker?)
red wire - green stripe with blue bands (right rear speaker)
red wire - light blue strip with blue bands (right rear speaker)

im certain i have the speakers sorted but what about the others?

any help would be much welcome