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General
Note: Interactive Electrical Troubleshooting DVD,
Form No. 492-9171 is also available.
Engine Starting
Turn the ignition switch to the RUN position, push the
glow plug switch for 10 seconds. The light will turn on.
Release the switch after 10 seconds. The light will turn
off. Turn the key to the start position and the glow plug
indicator light will come back on. When the engine starts,
release the key.
Important: Use starting cycles of no more than 30
seconds per minute to avoid overheating the starter
motor.
If the engine does not start immediately, move the
throttle control to fast and turn the key to the start
position.
Note: Additional starting cycles may be required
when starting the engine for the fi rst time
after the fuel system has been completely
without fuel.
Current fl ows from the ignition switch to the PTO switch.
It moves on to the brake switch, the two neutral motion
control switches, the fuel solenoid and fi nally to the
engine starter. Current fl ow branches from the two
neutral motion control switches and goes to the start
relay and the glow plug relay, which activate the starter
solenoid and glow plugs.
Z580/Z593/Z595 Diesel Service Manual
ELECTRICAL
Relays
There are 3 relays:
1. Glow Relay (furthest forward)
2. Start Relay
3. Fan Relay
Purpose
Glow Relay: Once the safety connections are made, the
relay will activate and provide current to the glow plugs
and oil pressure relay.
Start Relay: Once the safety connections are made,
the relay will activate completing the circuit to the starter
solenoid.
Fan Relay: Once the engine has started the oil pressure
switch closes and completes the grounding of the fan
relay to allow current to operate the radiator fan.
Location
The 3 relays are located to the left of the engine at-
tached to the top support strap (Fig. 647).
Fig 647
A. Glow Relay (furthest
away)
A A
B B
C C
PICT-4130
B. Start Relay (middle)
C. Fan Relay (closest)
6-1
6
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