Mach 460, bout to burn it down

I've done alot of research and can't find anything on the wiring that I need, I bought this mustang and the volume barely works, it has two places in the dash for a single din radio and something else, I'm assuming a tape player? (power wires are there just no plug, prev owner cut them)

the radio in it say Ford and is a cd/fm in one, single din, the stock power plug is still in tact, radio turns on but only works on the first volume level (maybe HU is blown, I have another to add, after market)

I read alot of posts on here saying "buy the adapter" now for my biggest problem!

I have the 3 amps (one under radio, two in trunk) the amp in the dash has 3 cords, one looks like an output and the other two are all in tact, now the part that plugs into the radio, there is a 6 pin plug the was in the back of the radio, it has cut but put back together (all colors matching) I followed the wire to find it was cut and splices into another wire (bunch of wires in a big gray shell) this go to the amp, well where they connect dont match color, also there's 8 wires coming from the amp and 6 from the radio, oh ya and only the tweeters work (even the junky one volume level head unit)

how can I fix all this? is there a way to buy a new OEM amp to radio plugs?

down to point question, will this be easy to fix?

sorry for spamming again but

I assume the wires coming from the amp goes to the radio in the 8 pin plug spot (but there is no plug it was cut and removed)

where does the 6 pin plug wire to? there are no other wires hanging besides power wires to the other opening assuming a tape deck.....

still doing research on this and I found this

http://ww2.justanswer.com/uploads/s420/2010-01-23_021238_97_Mustang_Audio_wiring_diagram2.jpg

on the right of the radio all the wires are here but with only one plug, to the amp.... now I can't fine this other plug, fits snug and it's a 6 wire where in the diagram is 8, could someone of put a different harness in this? I had to cut all the tape to remove these wires but somethings not right, I figured someone added another radio to this, but how to fix it?

I think i may know the problem, the stock power plug is fine, works on this radio (with ford written on the front)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=300553579851
Radio above

the back of this radio has 4 plugin spots and an antenna spot

1 - Main Power Harness
2 - small square 6 pin hook-up
3 - rectangle 8 pin hook-up
4 - small 2 pin hook-up
5 - Antenna Hook-up

number 2 above is the plug I have with the opposite end missing, the colors are

Orangle/black
Grey
Green/Orange
peach/black
Green/Red
Purple

makes no since to me, but if I hard wire the new aftermarket radio plug to the amps speaker cable it should work right? (just the speaker wires, I'll jump off the main power plug for all else)