John Deere 318 User Manual

Page 321

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1o

Battery Discharge
Lamp Ground
Circuit Test

Key switch OFF.

M37163 -UN-25JAN90

M77932 -UN-19JAN95

Check for continuity of
brown wire (A)
between TDC 8-pin
connector and bulb
socket (C) of the
battery discharge lamp
socket.

NO CONTINUITY:
Repair or replace
brown wire between
lamp socket and TDC
8-pin connector.

CONTINUITY: Check
for continuity between
(A and B) at TDC 8-pin
connector.

CONTINUITY: GO TO

1q

NO CONTINUITY:
Repair connector as
necessary.

1p

Battery Discharge
Lamp Short Circuit
Test

Key switch OFF.

Disconnect discharge
lamp socket from dash
panel.

Remove bulb from
socket.

Disconnect TDC
module 8-pin connector.

M36635 -UN-24APR89

Check for continuity of
brown wire between
bulb socket contact (A)
and ground.

CONTINUITY: Brown
wire is shorted to
ground. Repair or
replace.

NO CONTINUITY: GO
TO

1q

1q

TDC Module Test
for Discharge Lamp

NOTE: For this test,
battery voltage must be
12.3 or less.

Check battery voltage
using JT05685 Battery
Tester or a volt meter.

If more than 12.3-volts,
use the following
procedure to discharge
the battery.

M37179 -UN-25JAN90

Disconnect and ground
both spark plug leads.

Crank engine for
10—15 seconds.

Check battery voltage
to be sure it is less
than 12.3-volts.

Turn key switch to RUN
position.

LOOK: Discharge lamp
ON, indicating low
battery voltage.

M37358 -UN-25JAN90

Connect both spark
plug wires to spark
plugs.

Operate tractor at full
throttle until battery
voltage is at least 13.5
volts.

LOOK: Discharge lamp
OFF.

If battery does not
reach 13.5 volts after
several minutes
operating time, test
charging circuit.

GO TO

Å

, Group 25.

LAMP OFF: Circuit OK

LAMP ON: Replace
TDC module, then GO
TO

;

, Group 05.

MX,159024025,25-19-16MAY95

MX,159024025,26-19-16MAY95

MX,159024025,27-19-16MAY95

MX,159024025,28-19-16MAY95

Electrical System Diagnosis/Dash Lamp Circuit Tests

TM1590 (17MAY95)

240-20-9

316, 318 & 420 Lawn and Garden Tractors

020895

240

20

9

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