How It Works; Testing; Fuel Gauge; Purpose - Toro TX525 Service Manual

ELECTRICAL

How It Works

The digital hour meter is an electrical clock. It is not
repairable and can not be reset.

Testing

The digital hour meter should be replaced if any of the
functions do not work properly. Prior to replacing the
hour meter, check the continuity of the signal wire, using
a VOM multi-meter (ohm setting) connected between the
ground wire, the pink wire at the battery charge indicator
and the hour meter. If there is continuity, replace the
hour meter.

Fuel Gauge

Purpose

The fuel gauge indicates the fuel level in the fuel tank.

Location

The fuel gauge is located in the center of the control
panel (Fig. 0803).
5-4
Fig 0803 PICT-5274
How It Works
The meter moves in proportion to the amount of resist-
ance provided by the fuel sender located in the fuel
tank. The movement is dampened to compensate for
movement of the fuel inside the tank.
Testing
1. Check the 10 amp fuse.
2. With the gauge still connected to the harness, turn
the key to the ON position.
3. Using a VOM, set scale capable of reading 12 volts
DC. Connect the negative lead to the ground term-
inal (G) and the other lead to the positive terminal
(S) (Fig. 0804) to verify the conditions in the table
below.
4. Replace the gauge if the fuel sender tests correctly
but voltage/fuel level indication does not.
Terminal
G
I
S
S
*All voltage readings should be within 20%. (Typical values)
Rev. 000
G
I
S
Fig 0804
Reading
0 Volts - Ground
12 Volts (B+ from Ignition switch)
2.5 Volts tank full*
7.5 Volts tank empty*
TX525 Service Manual
IMG-6971