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
1. Check voltage to lamp.
1. If battery voltage is present, replace
14. Blackout Drive Light is
(a) Disconnect wiring harness from
blackout drive light or repair ground at
Inoperative.
blackout drive light (WP 0059 00).
light (WP 0059 00).
(b) Turn battery disconnect switch
2. If battery voltage is not present, go to
and engine start switch to ON
Test 2.
position (TM 5-3805-290-10).
(c) Select blackout drive light on main
light switch (TM 5-3805-290-10).
(d) Measure voltage at blackout drive
light between wiring harness pin,
circuit 8626 (GN), and ground.
2. Check continuity between main light 1. If continuity is present, replace main
switch and blackout drive light.
light switch (WP 0049 00).
(a) Disconnect wiring harness from
2. If continuity is not present, there is an
main light switch (WP 0049 00).
open circuit between blackout drive
(b) Turn battery disconnect switch
light housing and main light switch.
and engine start switch to OFF
Replace wiring harness in question
position (TM 5-3805-290-10).
(WP 0169 00 thru WP 0175 00).
(c) Check continuity at blackout drive
light between wiring harness pin
and main light switch wiring
harness pin D, circuit 8626 (GN).
1. Check coupler fuse (TM 5-3805-290-
1. If fuse is open, replace it.
15. Quick Coupler Switch is
10).
2. If fuse is OK, go to Test 2.
Inoperative.
2. Check voltage to coupler switch.
1. If battery voltage is present, go to Test
(a) Disconnect wiring harness from
3.
coupler switch (WP 0049 00).
2. If battery voltage is not present, there
(b) Turn battery disconnect switch
is an open circuit between coupler
and engine start switch to ON
switch and coupler fuse. Replace
position (TM 5-3805-290-10).
wiring harness in question (WP 0169
(c) Measure voltage at coupler switch
00 thru WP 0175 00).
between wiring harness pin 2,
circuit 123 (WH), and ground.
3. Check coupler switch ground circuit. 1. If continuity is present, go to Test 4.
(a) Wiring harness remains
2. If continuity is not present, there is an
disconnected from coupler switch.
open coupler switch ground circuit.
(b) Battery disconnect switch remains
Replace wiring harness in question
in ON position (TM 5-3805-290-
(WP 0169 00 thru WP 0175 00).
10).
(c) Turn engine start switch to OFF
position (TM 5-3805-290-10).
(d) Check continuity at coupler switch
between wiring harness pin 5,
circuit 200 (BK), and ground.
