![]() Thus, with older tractors and newer trailers, the trailer ABS is powered solely by the brake circuit and, upon each service brake application, the trailer ABS module will go through a "self check" where the ABS light comes on momentarily.įirst things first, does the ABS light come on and then go off within 1 or 2 seconds of applying and maintaining an application of the service brakes while the vehicle is in motion? If the light goes off, the trailer ABS is operating normally in that regard. However, most older tractors never had constant power to the blue wire as it was used for auxiliary purposes (like dump valve activation on spread axle trailers). ![]() That is designed as a backup to the constant powered "center pole" conductor (blue wire) should you have a failure. Your trailer ABS system IS correctly (and supposed to be) tied into your brake light circuit.
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