GMC, ignition coil replacement in Zevulun

GMC, ignition coil replacement in Zevulun.
When the coil is faulty, the ignition spark does not appear, the fuel does not ignite and a spark failure occurs. To replace the device, turn off the power by disconnecting the negative terminal from the battery. Disconnect the wires from the faulty coil and the car body attachments, remove the coil and install a new one in the reverse order.