Installation Manual

Electrical Installation

Service Connector (J4)

Factory Use Only

Twin Disc, Incorporated

Transmission Harness (J5, J6, J7 J8, and J12) Installation

Note: The J5, J6, J7, J8, and J12 wiring harnesses may be installed as one harness (standard) or individual harnesses. If your installation includes individual harnesses, proceed to the installation instructions for each harness. When completed with the Transmission Harness installation proceed to the J9 Harness installation procedure and omit the J12 installation procedure.

The Transmission Harness is a fully prefabricated harness that combines the wiring for the J5, J6, J7, J8 and J12 harnesses and connections. It consists of

2 separate harness assemblies. A Control to Bracket Harness (Figure 35) and a Bracket to Transmission Harness (Figure 36). Various harness options are available to accommodate different transmission and control system options.

The Control to Bracket harness connects to the EC300 and is routed to the mating circular connector mounted on the transmission bracket. The transmission is supplied with the Bracket to Transmission harness prewired.

The J5 wiring for engine throttle is available at the bracket and must be fabricated and wired by the customer. The Transmission Harness connectors contain all contacts and sealing plugs that are required to fill the connector contact positions. Sealing plugs must be installed into all unused connector contact positions in order to maintain the integrity of the connector.

Refer to General Electrical Installation Guidelines for harness routing criteria before proceeding with this section.

This section contains the following sub-sections:

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Control to Bracket Wiring Installation

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Bracket to Transmission Wiring Installation z

Neutral Start Interlock Wiring Installation z

Engine Throttle Wiring Installation z

Prewired Connection Inspection

78 EC300 Marine Control System Installation Manual #1024168