John Deere 318 - Manual (Page 321)

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