Engine Oil Pressure Switch
The switch is normally closed (NC) and opens with
pressure.
The switch opens at approximately 8 psi.
1. Turn ignition key switch ON. Oil pressure lamp should
be
on.
If lamp is not on:
1. Disconnect wire from switch and touch wire to a good
gr
ound, such as the engine block.
2. If lamp comes on, replace switch.
Figure 25
1
3. If lamp does not come on check wiring between lamp
and switch for continuity.
1. Engine oil pressure switch
If lamp is on with engine running:
1. Shut off engine immediately.
2. Check switch by disconnecting wire with ignition
switch
in ON position. Light should go out.
3. If light is still on, check for short circuit in wiring.
4. Install test gauge in engine oil pressure switch port.
Sta
rt engine and check for 30 psi minimum at 1500 rpm.
If engine pressure is good, replace switch. If engine
pressure is low, DO NOT operate the engine.
Fuel Gauge Sender
1. Disconnect wire and remove the fuel gauge sender
from the fuel tank.
2. Install an ohm meter between the terminal and base.
3. With arm completely down (empty position), resis-
t
ance should be 240 - 260 ohms.
4. With arm completely up (full position), resistance
should be 29 - 34 ohms.
NOTE: Bend float arm, if necessary, to get proper gauge
re
ading for a 1/2 full tank.
Make sure the sending unit is completely dry
(no fuel on it) before testing. Perform test
away from fuel tank to prevent an explosion
or fire from sparks.
CAUTION
Testing Page 5 - 26 Groundsmaster
®
455-D
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