John Deere 318 User Manual

Page 348

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SYSTEM SHORT
CIRCUIT TESTS FOR
20-AMP FUSE

M55140 -UN-13APR95

M77926 -UN-12APR95

NOTE: For machines:
316 (S.N. —475000)
318 (S.N. —475000)
420 (S.N. —595880),
A—20-Amp Fuse
B—2-Amp Fuse

NOTE: For machines:
316 (S.N. 475001— )
318 (S.N. 475001— )
420 (S.N. 595881— ),
C—20-Amp Fuse
D—3-Amp Fuse

THE 20-AMP FUSE
PROVIDES CURRENT
TO:

—Neutral Start
(Interlock) Circuit

—Lighting Circuit

—Ignition/Hour Meter
Circuit

—PTO Circuit

• If the 20-amp fuse blows each
time the key switch is turned to the
RUN position, there is probably a
short in the 20-amp fuse power
circuit, neutral start circuit or
ignition/hour meter circuit. Isolate
the short by using the following
method:

1. With the PTO switch in the ON
position, turn key switch to
RUN position.

FUSE DOESN’T BLOW: Go
to Step 2.

FUSE BLOWS: Short is in
the 20-amp fuse power circuit.

2. Put PTO switch at OFF
position, hydro lever in
N/STOP and engage park
brake (later models).
Disconnect TDC 8-pin
connector,
then turn key switch to RUN
position.

FUSE BLOWS: Short is in
the neutral start circuit.

FUSE DOESN’T BLOW: Short
is in TDC module or

ignition/hour meter circuit.

• If the fuse blows after pulling the
light switch to the ON position with
key switch in RUN position, then a
short is probably in yellow wires
between the light switch and lights.

• If the fuse blows only after the key
switch is turned to START position,
a short is probably in the purple
wire between key switch and starter
solenoid.

• If the fuse blows after PTO switch
is moved to ON position, the short
is either at the PTO clutch or blue
wires running between the PTO
switch, clutch and lamp. The short
is NOT in or before the TDC
module.

MOST LIKELY AREAS
TO CHECK FOR
SHORTS:

Wires routed through
panels or between
frame and deck.

Wires routed near
exhaust manifold or
muffler

Wires routed near the
drive shaft.

MX,159024030,18-19-16MAY95

Electrical System Component Tests and Adjustments/System Short Circuit Tests

TM1590 (17MAY95)

240-25-8

316, 318 & 420 Lawn and Garden Tractors

020895

240

25

8

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This manual is related to the following products:

316, 420