| Malfunction (Symptoms) |
Probable Cause |
Corrective Action (Remedies) |
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| Alternator output low (Voltmeter pointer below green with engine at 1500rpm) |
Drive Belts loose |
"Tighten and add belt dressing" |
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Regulator set too low |
Adjust |
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Loose field lead connection at alternator |
Tighten |
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brushes excessively worn |
Replace |
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Brushes not properly contacting slip rings due to weak springs |
Replace |
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Shorted Diode in rectifier assembly |
Replace Alternator |
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| Alternator output too low or too high (Voltmeter pointer in low red or in red above 16 VDC) |
Faulty Voltage Regulator |
"Check all wiring connections belts and bracket before checking regulator" |
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| Noisy Alternator |
Alternator Mounting Loose |
Properly install and tighten alternator mounting |
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Worn or frayed drive belts |
Install a new set of drive belts and adjust |
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Worn bearings |
Remove and install new alternator |
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Rotor Fan Damaged |
Remove and install new alternator |
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| Battery Electrolyte level consistently found low during periodic checks |
Excessive alternator output |
Replenish battery (Or replace if cells are damaged.) |
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Cracked or leaking battery case (container) |
Replace Battery |
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| "Coach voltmeter reads below 12 VDC with engine at 1000 to 1500 rpm and alternator output 13.8 to 14.2 VDC checked at equalizer ""A"" terminal" |
Defective diode in equalizer |
Replace equalizer |
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