ELECTRICAL SYSTEM
10H-22
ENGINE OIL PRESSURE SWITCH
TEST (SW7)
The oil pressure switch is pressure sensitive and acts
as a ground for the oil pressure light on the control
panel. When the engine is not running, a lack of oil
pressure creates a ground and illuminates the oil light
(L2). When the engine starts and builds pressure, the
sender opens and the light (L2) goes out.
Test the oil pressure sender as follows:
1. Shut down the engine and remove the ignition
key. Allow the engine to cool completely.
2. Remove the wiring harness connector from the
end of the oil pressure sender.
3. Set the multimeter to the continuity scale.
4. Place one test lead in the end of the sender and
the other test lead on the base of the sender
(Figure 10H-3).
Figure 10H-3. Oil Pressure Sender
5. Start the engine and perform the continuity test
again.
Continuity should not be available between the
sender end and the base with the engine running.
FUEL SENDER TEST (R3)
The fuel sender is a rheostat mounted underneath the
seat on the fuel tank. The fuel sender monitors the fuel
level and controls the fuel gauge. The fuel sender
resistance range is 33 (full) to 240 (empty).
Test the fuel sender as follows:
1. Shut down the engine and remove the ignition
key.
2. Pivot the seat and seat platform to the full upward
position.
3. Set the multimeter to the continuity scale.
4. Place one test lead on the fuel sender ground wire
and one test lead on a good frame ground.
Continuity should be available. If continuity is not
available, check for proper ground at the gauge.
5. Set the multimeter to the 2K scale.
6. Remove the wires from the sender. Place one test
lead on the fuel sender ground and one test lead
on the fuel sender stud.
Resistance should be available, depending on the
fuel level in the tank, between 33 (Ohms) and
240 (Ohms) If out of resistance range, replace
the sender. Connect wires to the sender.
7. Place the ignition switch in the RUN position.
8. While watching the fuel gauge, place a jumper
wire briefly between the fuel sender and fuel
sender ground.
The fuel gauge needle should move toward the
full mark when the jumper wire makes contact. If
the gauge does not respond, replace the gauge.
NOTICE
With the engine off, continuity should be available
between the end of the sender and the base.
WARNING
Beware of moving engine parts and do not become
entangled by loose clothing, jewelry, or hair. Serious
injury can occur if caught by moving engine compo-
nents.
NOTICE
If continuity is not available during testing, with the
engine off, the oil pressure sender may be faulty and
should be replaced. If continuity is available with the
engine running, perform an engine oil pressure test
with a gauge.
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