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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).
PAGE 66 — GENERATOR SERVICE AND TROUBLESHOOTING MANUAL — REV. #0 (08/29/23)
1
3
NO
COIL
4
2
1
CN10
RELAY (4-PIN)
NO
RED
CN11
2
YEL
65 AMP
FUSE
Figure 72. Glow Plug Relay
ENGINE GLOW PLUG RELAY
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.
STARTER (CRANK)
RELAY
4-PIN
GLOW PLUG
3
CN12
3
COIL
4
4
GLOW PLUGS
CN-H
PIN 1
CN3
PIN 2
RED
TO CN2 V24
CONTROLLER
(B+, TB2 AC1)
YEL
TO CN1 V10
CONTROLLER
(GND. SIGNAL)
NEG.
BLK.
POS.
TO CHASSIS
Y
E R
T T
B A
GND
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