Troubleshooting Fuses, Relays And Harnesses; Fuse, Relay And Harness; Fuse Burns Out; Test Check - Yanmar 6LY3 series Service Manual

Troubleshooting Fuses, Relays and Harnesses

12/05
TROUBLESHOOTING FUSES, RELAYS AND HARNESSES

Fuse, Relay and Harness

When a harness short-circuits, in some cases, the fuse burns out. (A fuse never burns out under the usual
state of use.)
If the power supply of the peripheral device is taken from the engine harness without notice, the fuse may
burn out.
All of the fuses for the 6LY3 engine are shown in the table below.
No. Fuse Size
1 10A AUX POWER
IGN. PANEL
2 10A
(Switch panel)
3 20A ECU
IGN. SIG
4 10A
(Switch ON signal)
5 5A YSDT
6 250A Air Heater "A"
7 250A Air Heater "B"
8 150A ALTERNATOR
9 50A STARTER RELAY
IGN. SIG 1st Station
10 5A
(Switch ON signal)
IGN. SIG 2nd Station
11 5A
(Switch ON signal)

Fuse Burns Out

1. When the location of the short circuit on the harness is found or when the causes of the short circuit are
clarified, repair as a temporary solution and replace the fuse. It is recommended to replace the harness
because of the possibility of decreasing waterproof quality on the harness and connector.
2. If the cause is undetermined, replace the fuse. If the fuse burns out again, replace the harness.

Test Check

Check the continuity by touching the corresponding fuse terminal to the ground. In the case of a fuse on a
relay assembly, open the fuse cover and check the continuity by touching the corresponding fuse terminal to
ground.

Checking a Fuse

1. Remove the fuse.
2. Check between both terminals for continuity.
3. If continuity is indicated, the fuse is in good condition.
6LY3 Service Manual
Application
Fuse box
Fuse box
Fuse box
Fuse box
Fuse box
Below the exhaust manifold
Below the exhaust manifold
Below the exhaust manifold
Below the exhaust manifold
Rocker switch panel (1st Station)
Rocker switch panel (2nd Station)
© 2007 Yanmar Marine International
TROUBLESHOOTING
Fuse Location Part No.
198535-52120
198535-52120
198535-52140
198535-52120
198535-52110
119578-77150
119578-77150
119578-77090
119578-77080
170203-91930
170203-91930
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