![]() If light goes off after a few seconds there is no active fault. A well charged 12 volt battery is the recommended source for a tester. This can be done by turning the key switch on a properly wired tractor connected to the trailer or switching the auxliary blue circuit using a light tester or other suitable means. This circuit must be powered on and off in proper sequence. It is generally applicable to trailers sold in the US market after March It is assumed the constant power to the ABS is provided by the auxiliary blue wire in the harness.
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