24-00-00 Page 24-8 Revised: February 28, 2002
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CHART 2401. TROUBLESHOOTING (ALTERNATOR)
Trouble Cause Remedy
Field circuit breaker trips. (cont) Short circuit in field winding of alternator. Disconnect field wiring at terminal of alternator. Turn on master switch. Reset breaker and if breaker fails to retrip, this isolates short circuit to field of alternator it self. Check brush holders for shorting against frame. If there are no obvious signs of a physical short circuit at field terminal or brush holder, replace alternator. (Note: Intermittent short circuit.) Internal short circuiting of the field can occur at various positions of the rotor, there-fore, reconnect field, reset breaker. — WARNING — TURN MAGNETO SWITCH TO OFF BEFORE TURNING PROPELLER. Pull propeller slowly by hand turning alternator rotor through 360° of travel. Observe circuit breaker for signs of tripping.
Output circuit defective. Short circuit in output circuit. Battery installed with reversed polarity. Disconnect wiring at battery post of alternator. Turn on master switch. Disconnect each leg of output circuit, working from the alternator towards the bus bar. Replace component or wire which was was isolated as defective. (See schematic.) Remove battery and reinstall with correct polarity.
24-00-00 Page 24-9 Revised: February 28, 2002
CHART 2401. TROUBLESHOOTING (ALTERNATOR)
Trouble Cause Remedy
Output circuit defective. (cont) Battery charged backwards. Remove battery. Connect load such as landing light lamp or similar load and discharge battery. Recharge with correct polarity and test each cell for signs of damage due to reversed charging. — Note — This type of condition can only occur in a case where a discharged battery has been removed from the airplane and put on a charger with the polarity reversed This reversal in polarity cannot occur in the airplane due to any fault in the alternator system.
Excessive ammeter fluctuation. Excessive resistance in field circuit. High field circuit resistance. Defective voltage regulator. Check all connections and wire terminals in field circuit for deterioration such as loose binding posts, broken wire strands at terminals, etc. Tighten all connections and replace faulty terminals. If problem persists, jump across terminals of the following components one at a time until the faulty unit is isolated. a. Field 5 amp (alternator) circuit protector. b. Alternator half of master switch. c. Overvoltage relay. Replace voltage regulator.
24-00-00 Page 24-10 Revised: February 28, 2002
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CHART 2402. TROUBLESHOOTING (BATTERY)
Trouble Cause Remedy
Discharged battery. Battery worn out. Low electrical system voltage. Standing too long. Equipment left on accidentally. Impurities in electrolyte. Short circuit (ground) in wiring. Broken cell partitions. Replace battery. Check voltage regulator voltage. Remove and recharge battery if left in unused airplane three weeks or more. Remove and recharge. Replace. Check wiring. Replace.
Battery life is short. Overcharge due to level of electrolyte being below top of plates. Sulfation due to disuse. Impurities in electrolyte. Low charging rate. Maintain electrolyte. Replace. Replace battery. Check voltage regulator voltage.
Cracked cell jars. Hold-down bracket loose. Frozen battery. Replace battery and tighten. Replace.
Compound on top of battery. melts. Charging rate too high. Reduce charging rate. Check voltage regulator voltage.
Electrolyte runs out of vent plugs. Too much water added to battery and charging rate too high. Drain and keep at proper level and check voltage regulator voltage.
24-00-00 Page 24-11 Revised: February 28, 2002
CHART 2402. TROUBLESHOOTING (BATTERY)
Trouble Cause Remedy
Excessive corrosion inside container. Spillage from overfilling. Vent lines leaking or clogged. Charging rate too high. Use care in adding water. Repair or clean. Adjust voltage regulator voltage.
Battery freezes. Discharged battery Water added and battery not charged immediately. Replace. Always recharge battery for 1/2 hour following addition of water in freezing weather.
Leaking battery jar. Frozen. Replace.
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