316, 318 and 420 electrical schematic—dual pto – John Deere 318 User Manual

Page 301

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316, 318 AND 420 ELECTRICAL SCHEMATIC—DUAL PTO

A1—TDC Module

M2—Starter Motor:

X4—Front PTO Switch 3-Pin

X17—Headlight Harness

A2—Ignition Module

316 (S.N. —362983)

Connector

Connector

(S.N. 420001— )

318 (S.N. —364137)

X5—Rear PTO Harness 3-Pin

1-Pin (S.N. —475000)

B1—Engine Oil Pressure

420 (S.N. —360009)

Connector

2-Pin (S.N. 475001— )

Switch

N1—Voltage

X6—Rear PTO Switch 2-Pin

X18—Tail Light Harness

C1—Condenser

Regulator/Rectifier

Connector

Connector

(S.N. 420001— )

P1—Front PTO Indicator

X7—Rear PTO Switch 3-Pin

1-Pin (S.N. —475000)

E1—Spark Plug

P2—Rear PTO Indicator

Connector

2-Pin (S.N. 475001— )

E2—Spark Plug

(Optional)

X8—Brake Switch 2-Pin

X19—Engine Oil Pressure

E3—Ignition (Breaker) Points

P3—Hour Meter

Connector:

Switch 1-Pin Connector

(S.N. —420000)

P4—Battery Discharge

316 (S.N. 596121— )

X20—Hour Meter 1-Pin

E4—Left Headlight

Indicator

318 (S.N. 600305— )

Connector

E5—Middle Headlight

P5—Engine Oil Pressure

420 (S.N. 595881— )

X21—Hour Meter 1-Pin

E6—Right Headlight

Indicator

X9—Transmission Neutral

Connector (Ground)

E7—Left Tail Light

S1—Key Switch

Switch 1-Pin Connector

X22—TDC Module 2-Pin

E8—Right Tail Light

S2—Front PTO Switch

X10—Transmission Neutral

Connector

F1—20-Amp Fuse

S3—Rear PTO Switch

Switch 1-Pin Connector

X23—TDC Module 8-Pin

F2—2-Amp Fuse:

(Optional)

X11—Seat Switch 2-Pin

Connector

316 (S.N. —475000)

S4—Brake Switch:

Connector

X24—Rear PTO Clutch 1-Pin

318 (S.N. —475000)

316 (S.N. 596121— )

X12—Engine Harness 3-Pin

Connector (Ground)

420 (S.N. —595880)

318 (S.N. 600305— )

Connector

X25—Rear PTO Lamp 1-Pin

3-Amp Fuse:

420 (S.N. 595881— )

X13—Voltage

Connector (Ground)

316 (S.N. 475001— )

S5—Transmission Neutral

Regulator/Rectifier

X26—Front PTO Clutch 2-Pin

318 (S.N. 475001— )

Switch

1-Pin Connector (VDC

Connector

420 (S.N. 595881— )

S6—Seat Switch

Output)

X27—Single Point Ground

F3—25-Amp Circuit Breaker

S7—Headlight Switch

X14—Voltage

1-Pin Connector:

G1—Battery

T1—Ignition Coil

Regulator/Rectifier

316 (S.N. 596121— )

G2—Stator Alternator

W1—Engine Ground

1-Pin Connector

318 (S.N. 600305— )

K1—Starter Solenoid:

(S.N. 475001— )

(Stator)

420 (S.N. 595881— )

316 (S.N. —362983)

X1—Key Switch 5-Pin

X15—Voltage

Y1—Front PTO Clutch

318 (S.N. —364137)

Connector

Regulator/Rectifier

Y2—Rear PTO Clutch

420 (S.N. —360009)

X2—Key Switch 1-Pin

1-Pin Connector

(Optional)

M1—Starter Motor:

Connector

(Stator)

316 (S.N. 362984— )

X3—Front PTO Switch 2-Pin

X16—Headlight Switch 2-Pin

318 (S.N. 364138— )

Connector

Connector

420 (S.N. 360010— )

Legend For Electrical Schematic

NOTE:

Wire colors are the same for all machines.
Wire numbers indicated on schematic are for
machines (S.N. 475001— ).

1. For 316 (S.N. —596120), 318 (S.N.
—600304) and 420 (S.N. —595880)
machines, brake switch (S4) is not used.
Purple wire “710” connects transmission
neutral switch directly to terminal “S2” of key
switch.

2. For machines (S.N. —475000), a light
green wire is used instead of the red “210”
wire used on later machines. The green wire
connects to terminal “B” of key switch (S1),
not to circuit breaker (F3) as does the red
“210” wire.

NOTE:

3. The electrical schematic shows ground
circuits for machines (S.N. 475001— ). For
these machines, all component grounds
terminate (spliced) inside the main harness
with one wire connecting to a single ground
point at the engine.

For machines (S.N. —475000), the (blk)
ground wires for the PTO lamps, hour meter,
and TDC module (2-pin connector) terminate
at the right pedestal panel. Exterior
components, such as the PTO clutches and
head and tail lights use the tractor frame for
ground.

MX,159024015,4 -19-16MAY95

Electrical Schematics/Dual PTO

TM1590 (17MAY95)

240-10-5

316, 318 & 420 Lawn and Garden Tractors

020895

240

10

5

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316, 420