THRUSH AICRAFT, INC - MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
10 - 8
Effective: 01/01/08
Table 10-1: ELECTRICAL TROUBLESHOOTING CHART
BATTERY SYSTEM
TROUBLE PROBABLE CAUSE
REMARKS
Battery fails to
hold charge
Battery defective
Replace battery
Battery will not
come up to full
charge
Defective Alternator
Defective Voltage Reg.
Charging rate to low
Check
Check
Check voltage regulator and adjust to
27.5± .2 VDC
Battery
consumes water
rapidly
Charging rate too high
Check voltage regulator adjust to 27.5
±.2 volts
Electrolyte level too high
Remove excess electrolyte & adjust
specific gravity
Excessive charging rate
Check voltage regulator for correct
voltage
Electrolyte runs
out drain tube
Vent caps loose or
broken
Tighten or replace caps
Standing too long
Remove battery and recharge
Equipment left on
Remove battery and recharge
Short circuit in wiring
Check wiring and correct
Battery
discharged
Charging rate too low
Adjust voltage regulator to 27.5±.2
Battery discharged,
defective or
disconnected
Check battery, recharge or replace
battery
Blown C/B in battery
control circuit
Check C/B and reset if necessary
Defective wiring in
battery control circuit
Continuity. Check circuitry and repair
as necessary
Defective battery relay
Check relay for proper operation and
replace as necessary
No power
indicated with
battery switch
on
Battery switch defective
Check switch for proper operation.
Replace if necessary
Power on with
battery switch in
OFF position
Shorted or sticking
contacts
Check switch and relay for proper
operation. Replace if necessary.