Table 9-3. Preventive Maintenance Checks and Services for Electrical Power Systems(Continued)
B - Before
D - During
A - After
H - Hourly Interval
CHECK FOR AND HAVE
IS NOT READY/
REPAIRED OR ADJUSTED
B D A
Turn HEAT-START switch to HEAT.
Observe the ammeter. Each 12 V
glow plug draws approximately 12.5
A and each 24 V glow plug draws
approximately 6.5 A. The ampere
draw of one glow plug multiplied by
the number of engine cylinders will be
the total ampere draw of the glow
plugs in the engine. A low reading indi-
cates one or more defective glow
If a defective glow plug is indicated,
disconnect one glow plug lead at a
Turn switch to the HEAT position.
Observe the ammeter. Reconnect the
The glow plug that does not change
the reading on the ammeter, when the
switch is turned on, is the defective
To replace the defective glow plug,
disconnect the lead wire at the defec-
tive glow plug.
Remove the defective glow plug.
10) Apply anti-seize compound to the
threads of the new glow plug.
11) Install the new glow plug and tighten to
a torque of 45 to 53 N (10 to 12 Ib/ft).
12) Turn the HEAT-START switch to the
HEAT position and observe the
13) Release the switch.
14) Install the lead wire.
15) Turn the HEAT-START switch to the
HEAT position. The reading should be
increased. If the reading is the same,
check the glow plug wiring.
16) Disconnect the test ammeter.