Since there isn't an adapter to go from a semi 7-Way to an RV 7-Way the best solution is going to be to install a separate RV style 7-Way on your 2007 International 4400.
You can use installation kit # ETBC7. You may be able to tap into the circuits on the existing 7-Way as long as the turn signals and brake lights are combined on the same circuit. If not then you will have to first install a 4-Way using # 119178KIT.
If the circuits are combined on the existing semi 7-Way then all you... view full answer...
The brake light switch wire on the Tekonsha Primus IQ Trailer Brake Controller - 1 to 3 Axles - Proportional # TK90160 should be positive. That means there will be 12V power running through the wire when the brakes are applied. view full answer...