Removing Harness Need Help

[MustangMando]

I am trying to remove main harness, but gets caught up on heater box. How do I remove heater box to remove harness.
Thanks

 

[madspeed]

Pull harder wilbur

 

[jrichker]

The harness comes out through the engine bay. It is a lot like wrestling a python to get it out!.

 

[84Ttop]

It will come out from under the dash but isn't easy. Keep trying, you'll get it