The M-30T ™ ABS modulator-valve utilizes a 3-pin external electrical connector, where the MC-12 ™ modulator used a 4-pin internal connector.ĬHART 1 - MC-30 ™ CONTROLLER AND MC-12 ™ MODULATOR DIFFERENCES The MC-30 ™ controller has a 30-pin electrical connector and the MC-12 ™ modulator has a 14-pin connector. The MC-12 ™ modulator utilized a metal ECU enclosure and was directly bolted to the modulator body. The EC-30T ™ controller has a black plastic enclosure similar to the Bendix ® EC-30 ™ tractor ABS controller, and is mounted to the modulator-valve with a bracket. The MC-30 ™ controller has been designed to replace the MC-12 ™ modulator as the standard Bendix trailer ABS controller assembly for OEM and aftermarket installations. MC-30 ™ CONTROLLER COMPARISON TO MC-12 ™ MODULATOR PLC signal for dash mounted trailer ABS indicator lamp (Towed vehicles manufactured after March 1, 2001) M-30T ™ ABS modulator-valve with relay function (1 or 2) EC-30T ™ ABS Electronic Control Unit (ECU) (1) The MC-30 ™ controller ABS installation consists of the following components: Reinstallation of the MC-30 ™ Controller or 17 MC-12 ™ Modulator / MCE-12 Service-Replacement. MC-30 ™ Controller Comparison to MC-12 ™ Modulator.2