check grounds as well the ground completes the circut back to battery .Fusable link to starter? My car had two ecm fuses one at the drivers door and one in the engine compartment.
A story for you had a car that would not prime when key was on got another ecm would not again ,got another ecm it would and the two that would not were rebuilt with same blue sticker. that is the sort version . Morale check all parts again as even new parts can be bad . Like my tps for the same car new out of box.