Audio Systems: Chrysler Infinity, pin female connector, infinity speakers

Question
This is a junkyard tinkering special.
Wife is upset so I got find a solution.  
I have transplanted an Infinity Sound System (amp, and wiring harness) from a 1995 Chrysler LHS to a 1990 Caravan.  Physically everything appears to be OK.  The problem is no front to rear fade control.  Side to side control is marginal and seems to be more prevelant to the left front.  
The 1990 Caravan was NOT originally equipped with Infinity Stereo but I have the Infinity harness from another 1990 Caravan (Relay, Choke, and speakers with amps)
The radio (head unit?) was missing from the doner LHS so I am using the cassette/tuner from the 1990 Caravan.  Fade controls are the outer ring of the tuning knob.  Connectors match and i downloaded a wiring diagram from our local library to check colors.
The amp has been bolted under the driver's seat and ground wire was connected to a convenient screw.  All wires have been carefully crimped.  
I returned from the junkyard with a complete set of (7) Infinity speakers from the LHS.  The radio was also missing from this LHS so I picked up a dolby cassette Infinity radio from a 1988 Dynasty.  Key feature on the dolby radio is a "joystick" speaker control.  Am I on the right track?  Will this cure my fade problems?  
I am also curious the ground bolt/strap has an additional spade on on it.  I believe it was a yellow/blue wire separate from the speaker plugs.  Also interesting is what appears to be a 7-pin female connector and a connector that looks like it came from my computer.  I think I am seeing 10 or 12 pins.    
I know it kind of sounds like a mess but can you help?  

Answer
Ok, the good news is almost any Dodge deck works in almost any  other model. That being said, the fade/balance controls on these decks are notrious for failing. I hope you didn't spend lots of $$$ on these used parts, as you can buy a nice CD and new speakers very reasonably, and will outperform the old Infinity systems. One common issue is that minivans can have headphone outlets in the back, and this adds more complexity to the wiring.
Your separate wire with female spade was the original ground wire, but the large metal braid ground strap is the best. Nothing wrong with hooking them both up either.
The plug on the back of the Infinity was used for add on CD changers, that were pretty rare in my experience. You can buy adaptors to add an aftermarket changer using this direct port, but with this age of deck, the money would be better spent on a new single CD headunit.