TM 5-3805-291-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 2. Electrical System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. Check coupler switch ground circuit. 1. If continuity is present, go to Test 7.
15. Quick Coupler Switch/
(a) Wiring harness remains
2. If continuity is not present, there is an
Alarm is Inoperative -
disconnected from coupler switch.
open coupler switch ground circuit.
Continued.
(b) Battery disconnect switch remains
Replace wiring harness in question
in ON position (TM 5-3805-291-
(WP 0195 00 thru WP 0201 00).
10).
(c) Turn engine start switch to OFF
position (TM 5-3805-291-10).
(d) Check continuity at coupler switch
between wiring harness pin 9, wire
200 (BK), and ground.
7. Check coupler solenoid circuits.
1. If continuity is present, replace coupler
(a) Wiring harness remains
switch (WP 0055 00). If problem still
disconnected from coupler switch.
exists, replace coupler valve (WP 0149
(b) Battery disconnect switch remains
00).
in ON position (TM 5-3805-291- 2. If continuity is not present for all
10).
circuits, there is an open circuit
(c) Disconnect wiring harness from
between coupler switch and coupler
coupler solenoid (WP 0149 00).
valve. Replace wiring harness in
(d) Check continuity at coupler switch
question (WP 0195 00 thru WP 0201
between wiring harness pin 3, wire
00).
779 (WH), and coupler solenoid
wiring harness pin 1, wire 779
(WH).
1. Check for cooling or fuel system leaks. Repair any leaks. If problem still exists, go
16. Arctic Heater is
to Test 2.
Inoperative.
2. Check arctic heater fuse (WP 0161 00). 1. If fuses are open, replace them.
2. If fuse is OK, go to Test 3.
3. Check for power to arctic heater.
1. If battery voltage is present at both
(a) Disconnect wiring harness from
pins, go to Test 4.
arctic heater (WP 0161 00).
2. If battery voltage is present at C2 only,
(b) Turn battery disconnect arctic
go to Test 5.
heater and engine start switches to 3. If battery voltage is present on pin A1
ON position (TM 5-3805-291-10).
only, there is an open circuit between
(c) Measure voltage between arctic
arctic heater fuse and arctic heater.
heater wiring harness pin A1, wire
Replace wiring harness in question
N725 (RD), and ground; and
(WP 0195 00 thru WP 0201 00).
between arctic heater wiring
harness pin C2, wire 117 (RD),
and ground.
