TM 5-3805-290-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 2. Electrical System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
5. Check for an open stoplamp relay coil 1. If battery voltage is not present, go to
9.
All Stoplamps Are
ground circuit.
Test 6.
Inoperative - Continued.
(a) Stoplamp relay remains removed. 2. If battery voltage is present, there is an
(b) Battery disconnect switch remains
open stoplamp relay coil ground
in ON position (TM 5-3805-290-
circuit. Replace wiring harness in
10).
question (WP 0169 00 thru WP 0175
(c) Turn engine start switch to OFF
00).
position (TM 5-3805-290-10).
(d) Select service drive mode on main
light switch (TM 5-3805-290-10).
(e) While pressing and holding brake
pedal, measure voltage at
stoplamp relay between wiring
harness pin 1, circuit 677 (GN),
and ground.
6. Check stoplamp relay coil power
1. If continuity is not present, there is an
circuit continuity.
open circuit between stoplamp relay
(a) Disconnect main light switch from
and main light switch. Replace wiring
wiring harness (WP 0049 00).
harness in question (WP 0169 00 thru
(b) Stoplamp relay remains removed.
WP 0175 00).
(c) Turn battery disconnect switch to 2. If continuity is present, go to Test 7.
OFF position (TM 5-3805-290-
10).
(d) Check continuity between
stoplamp relay wiring harness pin
1, circuit 677 (GN) and main light
switch wiring harness pin C,
circuit 677 (GN).
7. Check main light switch.
1. If continuity is present, replace main
(a) Main light switch remains
light switch (WP 0049 00).
disconnected from wiring harness. 2. If continuity is not present, go to Test 8.
(b) While pressing and holding brake
pedal, check continuity at main
light switch between wiring
harness pin A, circuit 697 (GN)
and K, circuit 698 (PU).
8. Check main light switch output circuit. 1. If continuity is present, go to Test 9.
(a) Main light switch remains
2. If continuity is not present, there is an
disconnected from wiring harness.
open circuit. Replace wiring harness in
(b) Disconnect stoplamp switch from
question (WP 0169 00 thru WP 0175
wiring harness (WP 0049 00).
00).
(c) Check continuity at main light
switch between wiring harness pin
A, circuit 697 (GN), and stoplamp
switch wiring harness pin A,
circuit 130 (RD).
0008 00-34
