John Deere 318 - Manual (Page 301)

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