Connectors and Wiring Harness Requirements 5 Connectors and Wiring Harness Requirements Industrial engines have several attachment options in the price list that provide different options for the customer to interface to the engine ECU. The options are summarized as follows: • ECU Only (standard option) • Customer Harness • Factory Installed Panel The ECU Only option is included in the base engine pricing arrangement. Customer harness and factory installed panels are price listed options. The ECU Only option provides complete access to all ECU connections and has the customer providing all wiring to the engine.
The Customer Harness and Factory Installed Panels provide the 70-pin connection to the ECU, a service tool connector on engine, and a customer interface connection. The customer interface connection can vary depending on which attachment option is selected. Typically the customer connector interface is a Deutsch DRC 40-pin connector. This section covers component and wiring harness design requirements for the customer to design the required harnessing to interface to the engine. The requirements spelled out in this section are the same used by Caterpillar in the construction of engine wiring harnesses.
Adherence to these requirements by the customer will provide the same level of reliability, durability, and performance that are characteristics of Caterpillar engine harnesses. For example, when properly constructed, the customer harness should protect against moisture entry into the connectors when the connectors are temporarily immersed in water. The pinout information for the ECU and customer harness connectors are not included in this section. The pinout information can be found within the section that defines a components installation and also in pinout summary tables in the Appendix.
5.1 Wiring Harness Components 5.1.1 Deutsch DT Connector The DT connector is the low-cost preferred choice for inline applications. The connector is available in 2, 3, 4, 6, 8, and 12 terminal configurations. It is also intended for SAE J1939 application use. The wire size range the connector will accept is 0.8 mm 2 (18 AWG), 1.0 mm 2 (16 AWG), and 2.0 mm 2 (14 AWG). The plug assembly with interface seal accepts socket terminals and the receptacle assembly accepts pin terminals. Sealing plugs are to be used in unused wire cavities. The DT connector has a wedge that locks the pins and the sockets in place. The wedge can be removed and replaced without cutting the wires.
The wedge removal tool (p/n 147-6456) can be used to aid in the removal of the wedges. When the receptacle is inserted into the plug, a click should be heard as the two halves lock together. The connector should not be able to be pulled apart. A P P L I C A T I O N A N D I N S T A L L A T I O N G U I D E 25