95 cadillac concourse

i purchased a alpine  50x4 head unit from curcit city. the installers wernt in so i had the salesmen look up the corect wiring harness and ant. adapter for my vehicle. i was planing to do the install myself, but changed my mind quickly.  i realized that the head unit in my car was basicly a remote that controled the tuner and amp in the trunk. i have installed multiple stereos in my life but never have come across this before. so i decided to take circut city's free instal offer with puchase of stereo. the next day i took it into the shop they proceded to tell me it is a coplete rewire 120 buckes. of course i played stupid i told them they advratize free installs. they told me it's a bose system they had to bypass the stock amp to get it to work properly i gave them the 120 and left my car. 4 hours later i go back and my interior was in pieces and the kid is just looking at it scratching his head. now im a little pissed because i could of  got that far myself. he told me he would put it back togeather and i should bring it back the next day when the guy with  ''experience'' on theses is in. he could not find either set of door speakers so i told him to put the cd player in and hook up the speakers he could. he did so and what i got is the front center and the 2 6x9s. i brouht it back the next day left it for 4 hours came back they told me it was done i drove off i started to listen and realized i lost the center. the front door speakers were working the rear 6x9s were working but  not the rear door seakers. the head unit cut out when turned over 21 it goes on protection and i have to turn it off and back on to get sound again. the pre outs still work when it shuts off fr,bk,sw. i called circut city back and they told me to bring it back in. once again i left my car they later called to tell it was done when i got there i asked what was rong and he told me the reason for it cuttng out was not enuff volts to the memory wire. i got in my car left turned on my radio and still no front speaker or back door speakers now im hot 3 times they have had my car and still not right. i went right back and told them what was rong. the head installer tells me there is no way to have all the speakers in my car working off alpines unit. he said it is desined to run 4 speakers so the 7, 1 front 2 front doors 2 rear doors 2 on the back decklid. i knew somewhere someone made a wireing harness or diagram so i could hook up all factory speakers in my cadillac to a after market head unit. i was so fed up with curcit city because before they started the said no problem. like i said i played stupid i knew what a pain it was going to be. but they said they could do it  thats why i paid 120. now they had so much time invested in my car the didnt want to touch it any more i asked if they could switch the 6x9s to the rear doors would be great  so i could get a little amp to run the 6x9s and that way i could mount the amp right in the middle of the 2 speakers it will run. but they refused  they said i had 4 speakers working thats all there required to do. fine i guess ill pay 120 dallors for something i could do myself. and still not have the job done right. mind you they  where rushing so i have bulges where they never properly sucured plastic clips to the door frame. oh yeay the rattling now when the radio is off is horible it sounds like my car just might fall apart. O.K. now here is where some help would be appreciated. i talked to allpine and they said it doesent matter how many speakers you run its how many ohms you are trying you run. so i tried to figure out how many ohms the speakers are and had poor results. the only set of speakers i could identefi where the verry back 6x9s whitch were 10 ohms. and the only reason i found that out was it was clearly marked on the back of the magnet. the 6x9s looked to me like a/c delco not bose.the door speakers im estamating at 5 1/2 inch mid and 2'' tweater they are not stamped at all no ohms or make the magnets are preaty impressive for stock speakers. but again the dont look like bose product but  i could be wrong or mabey circut city didnt know and its just hoped up gm equipment. eather way it dont bother me im trying to prevent having to replace the stock speakers yet mabey as they blow 1 set at a time. that is if they do blow because they dont distort much and the original stereo was loud and clear enuff for me. ive come to learn now that they do make a kit to turn a after market into a pre amp so you use the original factory amp. i found out too late its all been preaty much cut out. so hears what im looking to do ive already hooked up the front L/R channel and the center buy taking one+from front L and one - from front R and hooked it up to the center speaker. the front of my car sounds great but only if the fader is all the way to the front. when i fade it to the back with the volume up the radio goes on protection. i turn the radio off, turn it back on and it works up untill about 20 and it shuts down again. i belive it is because of the 10 ohm 6x9s they are wired directly to the rear L and the rear R. i need to know where i can get the colors of the wires before the boot on the doors so i can splice them with wires running to the front behind the stero so i can run L/R door to L/R decklid parrellel and the same thing on the other side to drop the ohms down to prevent the stereo on protection i hope. any info at all that might help me in any way would be really appreciated. suggestions about where to go from here will help to sincerly pat anderson  bospj74@hotmail.com