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Table 6-1 Troubleshooting
Condition Possible cause Checks Action
Batteries Voltmeters should read
at least 12.5 or 25 VDC
Check each battery in
bank for correct voltage
Check electrolyte
Test and recharge bad
battery(s)
Replace battery(s) with
good battery(s)
Check battery and
ground connections
Check battery voltage
Check battery cables
and connections
Clean and tighten
connections as
necessary
Engine does not crank
with MANUAL
START
Battery circuits
Check engine starter
cables and connections
Clean and tighten
connections as
necessary
Engine does not crank
using MANUAL
START - Battery No. 1
MANUAL CRANK #1
switch
Check battery voltage
while holding
MANUAL CRANK #1
switch
Refer to schematic
Use volt/ohm meter to
determine which
component is faulty
Engine does not crank
using MANUAL
START - Battery No. 2
MANUAL CRANK #2
switch
Check battery voltage
while holding
MANUAL CRANK #2
switch
Refer to schematic
Use volt/ohm meter to
determine which
component is faulty
If voltage checks indicate batteries and circuits OK then the engine starter or the pilot (or starting)
contactors are faulty.