THRUSH AIRCRAFT, INC - MODEL S2R-G10
AIRCRAFT MAINTENANCE MANUAL
STARTER/GENERATOR - GENERATOR SYSTEM
TROUBLE PROBABLE CAUSE REMARKS
Zero or low voltage
indicated
Loose connection
Check connections throughout
system
Open or shorted field circuit in
generator or defective
armature
Test resistance of field. Check
field circuit connections.
Replace starter-generator if
defective.
Brushes not contacting
commutator
Clean brushes and holders
with a clean, dry, lint-free cloth.
Replace weak springs.
Brushes worn Replace brushes
Dirty commutator Clean commutator
Defective voltage regulator
circuit
Adjust or replace regulator
No generator output
Generator circuit breaker
tripped or 130 amp buss limit
fuse blown
Check for short circuit and
reset circuit breaker and / or
replace buss limit fuse
Improper connections
Check connections against
wiring diagram
Defective generator controls
switch Continuity.
Check switch for proper
operation and replace if
necessary.
Defective Reverse Current
Relay
With engine running, check for
27.5vdc at both GEN and
BATT terminals. If 27.5vdc at
GEN and 24vdc at BATT,
reverse current relay is faulty.
Defective generator
Check generator with an
ohmmeter and replace starter-
generator if necessary
Volt-ammeter does not
indicate
Defective wiring
Continuity. Check wiring and
repair as necessary
Defective meter Replace meter
Starter inoperative Circuit breaker tripped
Check for short circuit and
reset circuit breaker
Low battery
Check battery. Service and
recharge as necessary
Starter relay inoperative
Check relay for operation and
replace if necessary
Page Effective: 03/26/2010 10-8
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