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I have a SYNC 4 that was purchased for the year and make (obviously) of my Edge ST.  The issues is the dealers say if I install it in place it could short out everything (weird how it could).  Has anyone done this.  I can get the model of the unit when I get home.  Basically my Edge doesn't have the 401 package that includes this as standard.  I don't mind not having the other 401 package things but the SYNC 4 would be better then my SYNC 3.  Please offer insights!  Thanks all!

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I don’t see any reason why it would “short everything out”. I would start slow as far as connecting your systems to it. Take a look and see what the plug situation looks like and see if they look compatible at all. The first hurdle is the HVAC control plug. The plugs for the nav antenna & Sirius antenna are likely the same. The danger comes if the main harness plus ARE the same is if the actual pin outs are the same. For that you need a manual. OR. If the plug is the same, take the dive, plug the sucker in and see if the system boots. Look at it this way….if it works, you’ll be famous! Because I’ll be at the dealer buying one before your post is even is even uploaded!

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