Kubota M108S, Workshop Manual

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9-S14
M108S, WSM ELECTRICAL SYSTEM
Main Switch at START Position
1. Turn and hold the main switch at the START position.
2. Measure the resistances across the B terminal and the IG1
terminal, and across the B terminal, and the ST terminal.
3. If 0 ohm is not indicated, renew the main switch.
W1015222
(2) Air Heater Relay
Connector Voltage
1. Turn off the main switch.
2. Disconnect the 2P connector (3) and both white color lead and
red color lead from relay (1).
3. Measure the voltage with a voltmeter across white color lead and
chassis.
4. If the voltage differs from battery voltage the wiring harness or
slow blow fuse is faulty.
5. Turn on the main switch to at the PREHEAT position.
6. Measure the voltage a voltmeter across 2P connector's (4) 1
terminal and chassis.
7. If the voltage differs from the battery voltage, the wiring harness
or slow blow fuse is faulty.
W1019485
Functional Check
1. Remove the air heater relay.
2. Apply battery voltage across the 1 and 2 terminals, check
continuity across 3 terminal and 4 terminal as shown in figure.
3. If continuity is not established across 3 terminal and 4 terminal,
air heater relay is faulty.
W1020202
Resistance
B terminal –
IG1 terminal
0
Ω
B terminal –
ST terminal
0
Ω
A : Main Switch Side Connector 6G
Voltage
Main switch at
“OFF” White color lead –
chassis
Approx. battery voltage
Main switch at
“PREHEAT”
1 terminal – chassis
(1) Air Heater Relay
(2) Terminal
(3) 2P Connector (Relay Side) (4) 2P Connector (Wire Harness Side)
1 and 2 : Terminal
(1) Air Heater Relay
(2) Relay Connector 1 to 4 : Terminal
KiSC issued 06, 2007 A