HEATER GP-JW 3773042 - Caterpillar

Illustration 1. Internal harness in the ECM. The harness has either 10 or 11 wires depending on the change level of the ECM. This harness must be disconnected in order to remove the 9W2126 Relay Module.
Illustration 2. Location of the part number and change level markings on the 9W2126 Relay Module. The change level follows the dash behind the part number.
Illustration 3. Location of the part number and change level markings on the 8T9881 Control Group. The change level follows the dash behind the part number. The 8T9881 Control Group must be removed from the front panel of the 7C1000 EMCP in order to view the part number and change level.