You can power up the MyGig with an harness only but it will be a custom built one(not a LockPick harness), but there are limitations, such as no Turn-By-Turn Voice and no settable clock(but this one is even a problem if you have the CoastalETech LockPick adapter).
The other thing that you have to consider is the model of MyGig that you've purchased, specifically is it a low-speed unit or an high-speed unit? For your Magnum you need a low-speed radio. Check the model number on the tag that is on the top of the MyGig itself. As there are so many variations now there are too many to list here, but go to:
http://www.wkjeeps.com/wk_nav_2.htm#PARTS.
You will find a full list of the model numbers so you can then decipher which one you have.
After that you'll have to buy the correct wiring harness connector for the MyGig end. You can find the part number for it at:
http://dto.vftis.com/mopar/main.asp
You want the Radio C2 connector. Depending on how well your Chrysler-Dodge dealer takes care of you you'll pay between $50-75.00 for the connector only.
Then you need the dash harness end connector, which you can buy from a Metra dealer. I can't find the part number right at hand but the dealer can find it for you.
In total you're going to have about a $100.00 invested even before you begin.
After that, you can start building the harness, which isn't really too hard. You can find the pinning guide at the same site as the Chrysler OEM connector, for both ends.
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