speaker wiring layout

I have a 96 plymouth voyager minvan with the infinity speaker system that has 8 speakers When fade is to front, only the small speakers in dash have audio, the front door speakers and the 4 rear ones are all on the 'rear' mode and front door speakers rarely have any audio, would like to splice the front door speakers onto the front dash speaker to get more up front. Where do they all tie together,cant find it, has to be a splice somewhere because on back of radio there are only 2 speaker outputs for rear so the other rear speakers/front door speakers are tied in somewhere please help if you can roy

An Infinity system usually has a factory amplifier or two.  Consult the wiring diagram for your vehicle.Support the12volt.com