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
2. Check for open power circuit.
1. If continuity is present, replace main
11. One or Both Blackout
(a) Disconnect wiring harness from
light switch (WP 0049 00).
Markers Are Inoperative -
rear light housing (WP 0058 00).
2. If continuity is not present, there is an
Continued.
(b) Disconnect wiring harness from
open circuit between rear light housing
main light switch (WP 0049 00).
and main light switch. Replace wiring
(c) Measure voltage at inoperative
harness in question (WP 0169 00 thru
rear lamp between wiring harness
WP 0175 00).
circuit 24 and main light switch
wiring harness pin E, circuit 8628
(GY).
1. Determine condition.
1. If only one blackout stoplamp is
12. One or Both Blackout
inoperative, temporarily replace
Stoplamps Are Inoperative.
inoperative rear light housing cover
with a known good one (WP 0058 00).
If problem still exists, there is an open
circuit between rear light housing and
main light switch. Reinstall old cover
and repair housing (WP 0058 00) or
replace wiring harness in question (WP
0169 00 thru WP 0175 00).
2. If both blackout stoplamps are
inoperative but all other rear lights
operate correctly, go to Test 2.
3. If both blackout stoplamps and both
service stoplamps are inoperative, refer
to Malfunction 9, All Stoplamps Are
Inoperative in this work package.
2. Check for open power circuit.
1. If continuity is present, replace main
(a) Disconnect wiring harness from
light switch (WP 0049 00).
rear light housing (WP 0058 00).
2. If continuity is not present, there is an
(b) Disconnect wiring harness from
open circuit between rear light housing
main light switch (WP 0049 00).
and main light switch. Replace wiring
(c) Measure voltage at inoperative
harness in question (WP 0169 00 thru
rear lamp between wiring harness
WP 0175 00).
circuit 23 and main light switch
wiring harness pin N, circuit 8627
(PK).
There is an open rear light ground circuit. Replace wiring harness in question (WP
13. All Rear Lights Are
0169 00 thru WP 0175 00).
Inoperative.
