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Aircraft Alternator inoperative1. Loose drive belt.2. Open wiring between bus and alternator. Remove positive output lead from alternator and check for continuity to bus (Don't have power on). The power diode in the output lead will only allow current flow in one direction and it can be checked at this time also for an open or shorted condition. 3. Shorted or open field circuit. Check to insure that "ALT REG" circuit breaker is closed. Check for bus voltage at "*B" terminal of over-voltage relay (Master BAT and ALT switches on). If voltage is not present, check wiring back to bus. If voltage is present, check for bus voltage at "**F" terminal of over-voltage relay. If no voltage is present, overvolt relay is faulty and should be replaced. 4. Faulty regulator. 5. Open field winding in alternator. 6. Shorted diodes in alternator. 7. Open diodes in alternator. 8. Shorted or leaky RFI capacitor on Prestolite ALV-9407 alternators. 9. For gear driven alternators see "Gear driven alternator inspection procedure". 10. Grounding strap not installed. Alternators such as the Prestolite ALY-8403-G that use the Wico regulator require a grounding strap between the field terminal and the brush holder screw. These alternators should be identified with the "G" at the end of the part number. Don't use the ground strap with the Prestolite VSF type regulator. 11. Defective overvoltage switch.
12. Cessna 182 converted from generator to alternator intermittent alternator going off-line alternator too hot. Blast tube to cool the alternator has fixed this problem.
Shear drive used on Continental 520 engines. When this drive gets old it starts to slip and you get an intermittent alternator
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