Mach E GT Battery Contactors

See the contactors of a 2021 Ford Mustang Mach E GT high voltage battery. See the removal procedure and a functional demonstration of the contactors. TIMELINE: 0:00 Start 0:08 Introduction 0:44 High Voltage PPE required for internal battery service 1:35 The location of the battery junction block with contactors 2:00 High voltage negative and positive connections 3:00 The purpose of the contactors 3:25 A measurement of the battery voltage (380 Volts) before the contactors 4:25 A measurement of the battery voltage (0 Volts) after the contactors 5:21 Different scenarios of contactor failure 6:19 DC Fast charge contactors 6:50 Removal of the battery junction box electrical connections 11:40 Removal of the battery junction box bolts 12:04 Removal of the battery junction box 14:15 MUST SEE: The partially disassembled junction block 15:10 Three different junction block and fuse options (RWD, AWD, AWD GT) 16:57 Corrections to my earlier descriptions 17:50 MUST SEE: What is a contactor? What does it do? 19:30 MUST SEE: See a live demonstration of contactor operation 22:30 The contactors are controlled by the 12-volt circuits of the battery energy control module (BECM) 23:10 MUST SEE: The high voltage sensing lines for each contactor 26:00 Four 95 nF capacitors 27:10 Contactor connections to the front and rear inverters 28:40 MUST SEE: The purpose of the pre-charge contactor and resistor 29:20 See the rear inverter connections and function 29:50 See the large capacitor in the rear inverter 30:35 Why you must charge the capacitors through the pre-charge resistor 32:35 The sequence of contactor operation for powering on the car 34:35 The current sensor 35:30 The fused electrical connections to the DC-DC converter, onboard charger module, cabin coolant heater, and electric air conditioning compressor. 36:57 The purpose of the Auxiliary Contactor 38:30 The low voltage battery electrical connection 39:10 The interlock circuits 40:00 The green circuit board for contactor control 41:50 The DC Fast charge input connection 44:10 The sequence of DC Fast charge contactor operation for charging the HV battery 45:28 Video Summary ABOUT US Weber State University (WSU) - Davis Campus - Department of Automotive Technology - Ardell Brown Technology Wing - Transmission Lab. We teach current vehicle technologies to our automotive students at Weber State University and online. For more information, visit: http://www.weber.edu/automotive This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see http://www.weber.edu/automotive/J_Kelly.html ADDITIONAL TRAINING FOR YOU Join us for hybrid and electric vehicle training with two online courses and in a 5-day on-campus boot camp with Professor John D. Kelly. See http://www.weber.edu/evtraining DONATE TO OUR DEPARTMENT Please consider a donation to the Department of Automotive Technology at Weber State University here: http://advancement.weber.edu/Automotive