PAGE 66 — GENERATOR SERVICE AND TROUBLESHOOTING MANUAL — REV. #0 (08/29/23)
ENGINE GLOW PLUG RELAY
ENGINE GLOW PLUG RELAY (ISUZU ENGINES
ONLY)
The engine glow plug relay (Figure 72) is connected to the
engine glow plugs and directly to the battery via a 65-amp
fuse for pre-heating. This relay is controlled by the engine
control module (ECM).
The coil of the glow plug relay (pins 3 and 4) are controlled
by the ECM. Pin 3 is connected to B+ while pin 4 is waiting
to received a ground signal from the ECM. Once the ground
signal is received on pin 4, the normally open contact will be
closed and +12 VDC will be sent to the glow plugs. When
the warming of the glow plugs has been completed, the
ground signal will be removed from pin 4.
Figure 72. Glow Plug Relay
COIL
3
4
1
2
3
4
CN12
NO
CN10
POS.
NEG.
BLK.
RED
BATTERY
TO CHASSIS
GND
GLOW PLUG
RELAY (4-PIN)
4-PIN
YEL
YEL
RED
STARTER (CRANK)
RELAY
COIL
3
4
1
2
NO
CN3
65 AMP
FUSE
PIN 1
PIN 2
GLOW PLUGS
CN-H
CN11
TO CN2 V24
CONTROLLER
(B+, TB2 AC1)
TO CN1 V10
CONTROLLER
(GND. SIGNAL)
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