Service Manual

6-2 Z Master 500 Gas Series Service Manual
6
Note: Interactive Electrical Troubleshooting CD,
Form #492-9143 is also available.
ELECTRICAL
RELAYS
Purpose
There are as many as three relays in a Z500 air-cooled
or liquid cooled gas machine depending on model.
Relays have 4 functions in the Z500 gas machine:
1. Start Relay
2. Kill Relay
3. Fan Relay (liquid cooled gas only)
4. Fuel Pump Relay (Kohler EFI engine)
1. Start Relay: If all conditions of the safety system
are met, the start relay will activate allowing current
to ow to the starter solenoid when the ignition is in
the “start” position.
2. Kill Relay: If any of the conditions of the safety
circuit are not met during operation the kill relay is
de-energized which will ground the ignition coil.
3. Fan Relay: Activates when the ignition switch is in
the “run” position, energizing the cooling fan (Liquid
cooled machines only).
4. Fuel Pump Relay: (Kohler EFI engine): Activates
when the ignition switch is in the “run” position,
providing 12VDC to the fuel pump, fuel injectors and
ignition coils.
The Fuel Pump Relay is part of the Kohler engine
electrical system. Refer tot he Kohler engine service
manual for more detailed service information.
For reference purposes, Fuel Pump Relay wiring
terminal connections are listed below.
Terminal # Connection
30 Battery Voltage
85 Ignition Switch Voltage
86 ECU-Controlled Ground
87 Feed to Ignition Coils, Fuel Pump
and Injectors
87a Not Used
Fig 322 DSC-3161
Air-Cooled EFI Engine Model: Three relays located
on the left side of the unit, between the engine and the
frame (Fig. 322).
Fig 321 DSC-3159
Air-Cooled Engine Models: Two relays located on the
left side of the unit, between the engine and the frame
(Fig. 321).
Location
A. Start Relay (left) B. Kill Relay (right)
A. Fuel Pump Relay (left) C. Start Relay (right)
B. Kill/Safety Relay (middle)
A B
C
A
B
GENERAL