TM 5-2420-231-23-1
0028
Table 1. Engine Grid Heater Indicator Fault - Continued.
028
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Engine Grid Heater Indicator
Test Step 7. Check for Open Main
Fault - Continued
Chassis Wiring Harness.
1. Disconnect grid heater wiring har-
ness connector (WP 0007, Figure
15) from main chassis wiring har-
ness connector (WP 0007, Figure
16) (WP 0161).
2. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between main
Replace grid heater wiring harness (WP
chassis wiring harness connector
0161).
(WP 0007, Figure 16) terminals 1
Proceed to Test Step 10.
and 4. Resistance should be 5.0
Resistance Greater Than 5.0 Ohms -
ohms or less.
Proceed to Test Step 8.
Test Step 8. Check for Open Side
Console Wiring Harness.
1. Remove front instrument panel
right-side cover (WP 0176).
2. Disconnect side console wiring
harness connector (WP 0007, Fig-
ure 24) from main chassis wiring
harness connector (WP 0007, Fig-
ure 25) (WP 0170).
3. Using a digital multimeter, mea-
Resistance 5.0 Ohms or Less -
sure resistance between side con-
Replace main chassis wiring harness
sole wiring harness connector (WP
(WP 0154).
0007, Figure 24) terminal 7B and
Remove jumper wire from side console
machine ground. Resistance
wiring harness (WP 0007, Figure 28)
should be 5.0 ohms or less.
pins 16 and 36.
Proceed to Test Step 10.
Resistance Greater Than 5.0 Ohms -
Replace side console wiring harness
(WP 0170).
Connect grid heater wiring harness
connector (WP 0007, Figure 11) to grid
heater controller (WP 0007, Figure 12).
Install air cleaner barrier curtain (WP
0099).
Remove jumper wire from side console
wiring harness (WP 0007, Figure 28)
pins 16 and 36.
Proceed to Test Step 10.
Test Step 9. Verify That Symptom Is
Resolved After Bulb Replacement.
1. Ensure that all wiring harness con-
nectors are reconnected.
2. Connect batteries (WP 0157) and
turn ignition switch to the on posi-
tion (TM 5-2420-231-10).
0028-7
