Thread: Jb4 Confusion
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      02-05-2013, 05:51 PM   #4
idrift4wd
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Quote:
Originally Posted by Manuts View Post
If you currently have an JB3, you need to modify the harness in order to install the JB4. You also need to install a power wire. See link below

http://www.e90post.com/forums/showthread.php?t=489350
This.

i would take out the existing harness as it will not work with the new JB4 unit. use the Jb4 harness that you should have gotten with your jb4. jb4 are will not work if you dont have the right harness.