Connectors and Wiring Harness Requirements 5.1.4.4 ECU 70-Pin Connector Sealing (Weatherproofing) ECU connector interface seal is serviceable using Caterpillar part number 159-9322. 58 70 40 48 47 57 24 32 31 39 14 1 13 23 Connector Interface Seal 5.1.5 Connector Terminal Contacts There are two types of terminal contacts available for production use: machined, and stamped and formed. Machined terminal contact, also referred to as a solid contact, is used for low volume harness production and for field repair. Stamped and formed contact is used for high volume harness production and is the lowest cost terminal contact option. Terminal contacts are available with nickel or gold plating.
Gold plating should be used for applications of 5 volts or less and/or less than 100 milliamps. Typically these low level circuits require low resistance at the pin/socket connection and gold plating is the best low-cost choice. Nickel-plated contacts can be used in power-type circuits or circuits where low resistance at the pin/socket connection is not a concern. Gold-plated contacts can be used in all circuit applications regardless of the voltage and current requirements. Gold plating provides some marginal improvement in vibration versus nickel plating. Caterpillar requires that only gold-plated sockets be used in the ECU connector (J1). NOTE:
Deutsch nickel-plated stamped and formed terminals are not recommended for use because of excessive voltage drop experience in laboratory tests. 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 29