Fuel Pump Relay (Groundsmaster 3320) - Toro Groundsmaster 3280-D Service Manual

Fuel Pump Relay (Groundsmaster 3320)

Testing the Fuel Pump Relay
Groundsmaster ® 3280-D/3320
05138SL Rev B
g223021
1. Coil terminal
2. Normally closed term
The Groundsmaster 3320 uses a relay to energize the fuel pump. The fuel
pump relay is attached to the support bracket inside the right side frame near
the fuel filter.
Note: Prior to taking small resistance readings with a digital multimeter, short
the meter test leads together. The meter will display a small resistance value
(usually 0.5 ohms or less). This resistance is due to the internal resistance of
the meter and test leads. Subtract this value from the measured value of the
component you are testing.
1. Locate relay and disconnect the machine wire harness connector from the
relay.
2. Using a multimeter (ohms setting), measure coil resistance between terminals
85 and 86 (Figure 173). Resistance should be between 70 and 90 ohms.
3. Connect multimeter (ohms setting) leads to relay terminals 30 and 87.
Ground terminal 86 and apply +12 VDC to terminal 85. The relay should
make and break continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.
4. Disconnect voltage from terminal 85 and multimeter lead from terminal 87.
5. Connect multimeter (ohms setting) leads to relay terminals 30 and 87A. Apply
+12 VDC to terminal 85. The relay should make and break continuity between
terminals 30 and 87A as +12 VDC is applied and removed from terminal 85.
6. Disconnect voltage and multimeter leads from the relay terminals. Connect
relay to machine wire harness.
Figure 173
3. Normally open term
4. Common terminal
Page 6–75 Electrical System: Testing the Electrical Components