Wiring harness
When you receive the connector, you'll get the a bag containing the connector and 20 ~6" wires with pins crimped on the end. All you have to do is insert the pins you want to use and press the locking bar on the bottom of the connector to lock them in place. You can find detailed write-ups on how to do this with pictures on the Internet. Unfortunately I didn't take pics when I did it as the information was already readily available.
I may contact the poster of one of the write ups I used and ask if he would mind if I post his pics here.
If it happens to be the 20 Pin connector that connects to the back of any of the stock radios (including MyGig) then yes, it is the part. On the back of the stock radios, there are two 20 - Pin connectors and one 10 - Pin connector. Both of the 20 - Pin connectors are the same; although the wiring that connects to them is different.
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The Standard Dash Loom for the Nitro includes all three plugs that connect into the back of the HU, so a parts guy at the dealer (without specific knowledge of the electrical connectors and where to find them in the parts lists) will not be able to find the connectors we're looking for. These connectors are not listed or displayed in the exploded diagrams that they use to find parts.
Regardless of that, yes, 5083221AA (20 Pin Connector) is the connector you want for the 6 Disk changer. Using this connector in conjunction with beermonkey's write up will work.


