ok so heres the problem ive been working on replacing dash harness on my 96 s10 blazer because it had been hacked and spliced by previous owners causing electrical problems. when i got the dash off i realized i had to replace everything even the big part of the harness that runs along the firewall on the inside. im to the point where i need to disconnect it at the firewall but i cannot seem to figure it out i got the two bols off that hold it to the firewall but i cant seem to unplug it is there something im missing?

 

thanks in advance for any help anyone might be able to provide