TM 5-3805-298-23-2
0132
Table 1. One or Both Stoplights Do Not Operate, Turn Signals Operate Normally - Continued.
0132
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Install a jumper wire between
One or Both Stoplights Do
M-C7 (WP 0012, Figure 157)
Not Operate, Turn Signals
terminal 1 and M-C23 (WP 0012,
Operate Normally -
Figure 157) terminal 1.
Continued
4. Using digital multimeter
Resistance 5.0 Ohms or Less
(WP 0174), measure resistance
Replace lower cab wiring harness
between connector M-C1
(WP 0291).
(WP 0012, Figure 57) terminal 16
Proceed to Test Step 17.
and ground.
Resistance Greater Than 5.0 Ohms
Replace rear frame wiring harness
(WP 0295).
Proceed to Test Step 17.
Test Step 8. Test for Open Brake
Lights Fuse.
1. Turn battery disconnect switch to
OFF position (TM 5-3805-298-10).
2. Remove brake lights fuse from
fuse panel (TM 5-3805-298-10).
3. Using digital multimeter
Resistance 5.0 Ohms or Less Install
(WP 0174), measure resistance
brake lights fuse (TM 5-3805-298-10)
between terminals of brake lights
and proceed to Test Step 9.
fuse.
Resistance Greater Than 5.0 Ohms
Replace brake lights fuse (TM 5-3805-
298-10) and proceed to Test Step 16.
Test Step 9. Test for Faulty Blackout
Brake Light Relay.
1. Swap blackout brake light relay
with blackout headlight relay at
fuse panel (TM 5-3805-298-10).
2. Turn battery disconnect switch to
ON position
(TM 5-3805-298-10).
3. While an assistant presses the
Both Stoplights Operate Swap
brake pedal, observe operation of
blackout brake light relay back to
both stoplights (TM 5-3805-298-
blackout headlight relay position and
10).
replace blackout brake light relay
(TM 5-3805-298-10).
Proceed to Test Step 17.
Both Stoplights Do Not Operate
Proceed to Test Step 10.
Test Step 10. Test for Voltage at
Blackout Brake Light Relay.
1. Turn battery disconnect switch to
OFF position (TM 5-3805-298-10).
0132-5
