TM 5-3805-291-23-1
ELECTRICAL SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0013 00
ELECTRICAL POWER SUPPLY CIRCUIT TEST - CONTINUED
Expected Results. Battery voltage is present on terminal B and terminal R at engine start switch.
h.
(1)
If results are OK, voltage is present on terminal B and terminal R at engine start switch. Proceed to step 5.
(2)
If results are not OK:
If battery voltage is not present on terminals B or R, replace wiring harness in question (WP 0195 00 thru
WP 0201 00). Ensure seals are properly in place and connectors are securely connected. Verify repair elim-
inates problem.
(3)
If battery voltage is present on terminal B of engine start switch but not present on terminal R, replace
engine start switch. Return all wiring to original configuration. Verify problem is eliminated.
5.
Check voltage from main relay to "ECM SWITCH FUSE".
a.
Remove wire 112 PU from normally open terminal of main relay.
b.
Turn engine start switch to ON position (TM 5-3805-291-10).
c.
Measure voltage between normally open terminal of main relay and engine ground.
d.
Turn engine start switch to OFF position (TM 5-3805-291-10).
e.
Reconnect all wires to original configuration.
Expected Results. Voltage measures 24 3.0 VDC.
f.
(1)
If results are OK, verify "ECM Switch Fuse" is not blown. Replace wiring harness in question (WP 0195
00 thru WP 0201 00). Ensure seals are properly in place and connectors are securely connected. Verify
repair eliminates problem.
(2)
If results are not OK, proceed to step 6.
6.
Check voltage at main relay.
a.
Remove wire 308 YL from coil of main relay.
b.
Remove wire buss bar-2 from normally open contact of main relay.
c.
Turn engine start switch to ON position (TM 5-3805-291-10).
d.
Measure voltage between wire 308 YL and engine ground.
e.
Measure voltage between buss bar-2 and engine ground.
f.
Reconnect all wires to original configuration.
Expected Results. Voltage measures 24 3.0 VDC.
g.
(1)
If results are OK, verify wire 200 BK has continuity to engine ground. If wire 200 BK is OK, replace main
relay. Verify problem is no longer present.
(2)
If results are not OK, verify main circuit breaker is not tripped. Replace wiring harness in question (WP
0195 00 thru WP 0201 00). Ensure seals are properly in place and connectors are securely connected. Ver-
ify repair eliminates problem.
0013 00-21
