rear speakers

[JAY_D]

Hi, originally had a double din unit in my ep91 ( came with it from japan ).
Front & rear speakers worked fine with this. Replaced it with a kenwood stereo & got an iso lead from local ice shop but rear speakers wont work now. put back in the old stereo & removed the iso adapt an rear speakers work again...
Any ideas any1? wrong iso adapt or something else?

 

[Arnold]

The ISO block might need a couple of wires moving to get the rear speakers to work. I've seen that before with the positive/switched live sometimes needing swapping over. Can't imagine it's too difficult