I was going to stay out of this be a use its speculation only
But
Ford has a SIX VOLT line to the ignition.
It powers some relays upon starting.
Chevy has a five volt line.
If that controller back fed 12v to your ignition switch you might need a new if ition switch.
I'm sure a Ford dealerr would fix it easily.
I recently ruined two remote controls by waiting them backwards.
Both worked for a moment. Now they make the quietest little click on the remote relay and don't get enough power to actuate.
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