Engine swap

[Josh516]

Hi guys hoping someone can help or has been is my situation. I have a mk6.5 facelift fiesta zetec 1.2 and engine had Siezed I managed to get hold of a mk6 fiesta st 05 plate with bad rear end damage now swapped the st engine for my Siezed one and changed loom,ecu,all pipes and the locks the key transponder but the clocks don't fit as its a facelift model now with my standard clock and transponder everything seams to work but it won't turn over got fuel pumping light work ect but when I change the key transponder over from the st the horn stays on constantly and nothing seams to work in order any one had a problem like this before ? Cheers