Installation Manual

Twin Disc, Incorporated

Electrical Installation

Neutral Start Interlock Wiring Installation

The EC300 Control is designed to ensure that a control head is in command and that the lever is in the neutral detent position before an engine can be started. All EC300 Control Systems include a Neutral Start Interlock feature for prevention of start-in-gear situations. The Neutral Start Interlock is a relay contact inside of the EC300 Control. The relay contact closes only when the system ignition is turned on, a Control Head is selected, and the lever for the selected

Control Head is in the neutral position.

Neutral Start Interlock Wiring Requirements

Normally, the boat wiring routes the start command wire from the key switch or engine control panel through the EC300 Control’s Neutral Start Interlock. If a bypass or override switch is desired, contact Twin Disc Incorporated or a local distributor for information related to specific installation requirements. Damage or injury that is caused by improper installation is not the responsibility of Twin

Disc Incorporated or its distributors.

CAUTION

Bypassing of the neutral start interlock may cause damage or injury.

Twin Disc Incorporated and its distributors are not responsible for the results of any improper wiring. Contact Twin Disc Incorporated or a local distributor for recommendations related to any engine-room start switch.

Two contacts are provided in the Engine throttle connector kit (J5) for the neutral start interlock wiring. Connector J5 pin 9 and connector J5 pin 10 are for use with commonly available DC engine system voltages (12/24 VDC Nominal).

Install the Neutral Start Interlock portion of the Engine Control harnesses as follows (See Figure 40):

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Electrical Installation

Twin Disc, Incorporated

HARNESS, WIRING

ENGINE THROTTLE

CUSTOMER SUPPLIED

CUSTOMER SUPPLIED WIRE

ECM POWER SUPPLY

CONNECT FROM J8-2 TO J5-1

ENGINE CONTROL MODULE

SEE ENGINE CONTROL HARNESS INSTALLATION SECTION

NEUTRAL START RELAY CONTACT - N.O. (14 AWG)

NEUTRAL START RELAY CONTACT - COM. (14 AWG)

HARNESS, WIRING

ENGINE SPEED SENSOR

SEE ENGINE SPEED SENSOR HARNESS INSTALLATION SECTION

J5-9

J5-10

MANUAL OVERRIDE

SWITCH

START SWITCH

BATT+

BATT-

STARTER SOLENOID

BATT-

BATT+

CONNECTOR KIT

ENGINE THROTTLE

6 7

1

NEUTRAL START WITH RELAY

(USED WHEN STARTER RELAY SOLENOID IS 5 AMPS DC OR GREATER)

HARNESS, WIRING

ENGINE THROTTLE

CUSTOMER SUPPLIED

CUSTOMER SUPPLIED WIRE

ECM POWER SUPPLY

CONNECT FROM J8-2 TO J5-1

ENGINE CONTROL MODULE

SEE ENGINE CONTROL HARNESS INSTALLATION SECTION

NEUTRAL START RELAY CONTACT - N.O. (14 AWG)

NEUTRAL START RELAY CONTACT - COM. (14 AWG)

HARNESS, WIRING

ENGINE SPEED SENSOR

SEE ENGINE SPEED SENSOR HARNESS INSTALLATION SECTION

J5-9

J5-10

MANUAL OVERRIDE

SWITCH

START SWITCH

BATT+

STARTER SOLENOID

BATT-

CONNECTOR KIT

ENGINE THROTTLE

6 7

1

NEUTRAL START WITHOUT RELAY

(USED WHEN STARTER RELAY SOLENOID IS LESS THAN 5 AMPS DC)

Figure 40. Neutral Start Interlock Schematic J5 Harness

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Twin Disc, Incorporated

Electrical Installation

3.

4.

A Neutral Start Interlock Relay must be used for isolation if the starter relay/ solenoid current exceeds 5 amps DC. Use an isolation relay if the starter solenoid/relay current is unknown or if no means to measure the current is available.

Note: The EC300 Control’s neutral start interlock contacts and any hardwired transmission neutral interlock must be wired in series with the vessel’s starting circuit. If a hardwired transmission neutral start switch is present, then modify the following installation procedures to accommodate the switch.

The exact nature of the customer wiring will depend upon whether or not a relay is required. It will also depend upon the nature of the customer’s existing wiring.

The following steps assume that the Ignition Switch (start switch), the Starter

Solenoid, and the Neutral Start Relay (if used) are already installed.

Refer to General Electrical Installation Guidelines for harness routing criteria.

This section assumes an existing connection between the engine starting switch at the helm and the engine starting circuit. If a connection does not exist, it may be desirable to install this circuit before continuing.

1.

Disconnect the wire coming from the start switch at the helm from the start relay/solenoid and connect it to J5 pin 9.

2.

5.

Make a connection from J5 pin 10 to the start relay/solenoid using 14

AWG wire.

Route both yellow with a red stripe wires to the EC300 Control.

For the yellow with a red stripe wire from the start switch at the helm, crimp the supplied Deutsch contact (P/N 0462-209-16141) using the

Deutsch HDT crimp tool (P/N HDT 48-00).

Note: The Deutsch 14 AWG contact (P/N 0462-209-16141) can be identified by a green band.

Remove the locking wedge from the Deutsch connector.

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Twin Disc, Incorporated

6.

Insert the wire coming from the start switch at the helm into pin 9 of the

J5 connector.

Note: The J5 connector is provided in the Engine throttle connector kit.

7.

Note: Refer to the EC300 System Installation Drawings in the

Engineering Drawings Section for pin numbering information.

For the yellow with a red stripe wire from the starter relay/solenoid, crimp the supplied Deutsch contact (P/N 0462-209-16141) using the Deutsch

HDT crimp tool (P/N HDT 48-00).

8.

9.

Insert the wire coming from the start relay/solenoid into pin 10 of the J5 connector.

When all pins have been inserted in the connector body, then insert the

Deutsch locking wedge.

10.

Ensure that sealing plugs are installed in all empty connector positions.

11.

Align the harness connector with the J5 receptacle of the EC300 Control and push it in until it snaps into place.

12.

Secure all harnesses to a supporting structure with clamps or cable ties at 406 mm (16 in.) intervals.

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