Toro 4100-D Engine Oil Pressure Light, High Temperature Warning Light, Glow Plug Indicator Light

Warning Lights

Engine Oil Pressure Light

The oil pressure light should come on when the ignition switch is in the ON position with the engine not running. Also, it should light with the engine running if the engine oil pressure drops below 7 PSI (0.5 kg/cm2).

1.Disconnect green wire from the oil pressure switch on the engine (located near the starter motor).

2.Ground green wire to the engine block.

3.Turn ignition switch to ON; the oil pressure light should come on indicating correct operation of the elec- trical wiring to the oil pressure switch.

4.Turn ignition switch to OFF. Reconnect green wire to the oil pressure switch. Apply skin--over grease (Toro Part No. 505--165) to switch terminal.

High Temperature Warning Light

3

2

1

4

If the coolant temperature rises to approximately 220oF (105oC), the high temperature warning light should illu- minate as the dual temperature switch terminal closes.

NOTE: If the PTO is engaged when the dual tempera- ture switch terminal closes, the PTO will disengage.

To test the high temperature warning light and its circuit wiring, ground the blue wire attached to dual tempera- ture switch on engine water flange. The high tempera- ture warning light should illuminate.

Glow Plug Indicator Light

The glow plug indicator light should come on when the ignition switch is placed in ON prior to placing the ignition switch in START. The light should stay lit for approxi- mately 10 seconds while the ignition switch is left in ON.

Charge Indicator Light

The charge indicator light should come on when the igni- tion switch is in ON with the engine not running or with an improperly operating charging circuit while the en- gine is running.

Testing Warning Lights

1.Apply 12 VDC to terminals 1A and 2A.

2.Ground terminals 1B and 2B.

3.Both indicator lights should light.

Figure 15

1.	Charge indicator	3.	High temp warning
2.	Engine oil pressure	4.	Glow plug indicator

2		3
1	5	4
1B		1A (+)
2B		2A (+)

Figure 16

1.	Charge indicator	4.	Glow plug indicator
2.	Engine oil pressure	5.	Warning light back
3.	High temp shutdown

Electrical System

Groundsmaster 4100--D Page 5 -- 13 Electrical System