one more thing, if you don't have a good "hot start" button, get one. It's a good diagnosis tool for one, and two, it just might get you started and homeward bound just in case if the rest of the cab electrical is toast.
Are you talking about the trigger looking device to hook directly to the solenoid?
Like this:
https://www.amazon.com/INNOVA-3630-Remote-Starter-Switch/dp/B000EVU8MK