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To wire a brake controller on your 2007 International Trucks 4300 Series, you need to wire the controller's red wire to the stop light circuit. If the only wire you've found for brake lights is tied to the turn signal lights, then that wire cannot be used. The reason is that the turn signals, once engaged, would activate the brakes.
There may be a brake switch circuit that is sometimes abbreviated as the CHMSL circuit. Use a tester like part # PTW2993 to... view full answer...
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