How do you have the solenoid and starter wired up? Are you using a remote starter relay firewall mounted as well as the solenoid on the Ford starter? Mine is wired that way, but the ford diagram runs the 12V starter wire from the same side lug on the remote relay to the starter. The switched side of the firewall mounted relay then has a 16ga wire that runs to the solenoid on the starter and triggers that solenoid. I'm just wondering if your running the 12V+ through both the remote relay and the solenoid causing the issue.

-Scott