TM 9-2320-363-20-1
Table 3-1. Troubleshooting (Cont)
Malfunction
Test or inspection
Corrective action
ELECTRICAL SYSTEM (CONT)
Axle Lock Circuit (M915A2) (Cont)
Step 2.
Disconnect leads 87 and 81C from axle lock pressure switch. Check for
continuity between contacts of switch.
If continuity is indicated, go to step 3. If no continuity is
indicated, replace axle lock pressure switch (pages 4-178, 4-182).
Step 3.
Disconnect lead 87 from axle lock pressure switch. Check continuity between
lead 87 and ground.
If no continuity is indicated, repair lead 87 (page 3-2).
2. AXLE LOCK INDICATOR LIGHT DOES NOT OPERATE, AXLE LOCK OPERATES.
Disconnect lead 87 to pin D15 of warning light bar. Check for +12 VDC at lead 87.
If +12 VDC is present, troubleshoot panel light circuit
(page 3-58). If no voltage is present, repair lead 87 (page 3-2).
Axle Lock Circuit (All Except M915A2)
1. AXLE LOCK DOES NOT ENGAGE.
Step 1.
Disconnect leads 87 and 81C from axle lock pressure switch. Check for
continuity between contacts of switch.
If continuity is present, go to step 2. If no continuity is
indicated, replace axle lock pressure switch (pages 4-178,
4-182).
Step 2.
Check for +12 VDC at lead 81C from instrument splice terminal.
If +12 VDC is present, repair lead 81C. It no voltage is
present, troubleshoot instrument circuits (page 3-62).
2. AXLE LOCK INDICATOR LIGHT DOES NOT OPERATE, AXLE LOCK OPERATES.
Disconnect lead 87 to pin D15 of warning light bar. Check for +12 VDC at lead 87.
If +12 VDC is present, troubleshoot panel light circuit
(page 3-58). If no voltage Is present, repair lead 87 (page 3-2).
Change 3 3-67
