Glow Plugs; Glow Plug Test - Jacobsen HR5111 Service And Repair Instructions

GLOW PLUG TEST

See Figure 10L-1 and test a suspected faulty glow plug
as follows:
1. Shut down and allow engine to cool.
2. Disconnect glow plug lead wire.
3. Set multimeter to 200
POWER
OFF ON
200 1000 750 200
20
20
2
200m
20M
2M
200M
20K
2K
200
200
200m
20m
200µ 2m
10A
V - COM A
2A
MAX
500V
1000V
MAX
750V
MAX
10A MAX
SECTION 10L. GLOW PLUGS
Ω (ohms) scale.
20
2
200m
20M
2M
200M
20K
2K
200
200
200µ
COM
-
2A
MAX
2
200m
200µ
2m
20m
10A
200m
2
2
10A
Figure 10L-1. Glow Plug Test
4. Connect one multimeter test lead to glow plug ter-
minal and the other to housing.
•
The multimeter reading should be approximate-
ly 0.8 Ω (ohms) (cold). If the reading is at infinity
or 0 Ω (ohms) the glow plug is defective and
must be replaced.
20
2
200m
200µ
2m
20m
10A
200m
2
2
200m
20m
2m
10A
A
10L-1
ELECTRICAL SYSTEM
10L