You are here: HomeAircraft Engine PartsFAA-PMA Approved Aircraft Engine Alternator KitsPlane-Power AL24-P70 FAA-PMA Alternator replaces most Prestolite 24/28 volt, 70 amp and smaller alternators on Lycoming engines found in many Grumman, Commander, Mooney & Piper Aircraft

Plane-Power AL24-P70 FAA-PMA Alternator replaces most Prestolite 24/28 volt, 70 amp and smaller alternators on Lycoming engines found in many Grumman, Commander, Mooney & Piper Aircraft

Plane-Power AL24-P70 FAA-PMA Alternator replaces most Prestolite 24/28 volt, 70 amp and smaller alternators on Lycoming engines found in many Grumman, Commander, Mooney & Piper Aircraft
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Item #:AL24-P70
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Price:$499.95
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The Plane Power AL24-P70 FAA-PMA approved Alternator is a direct replacement for Prestolite 24/28 volt, 70 amp Alternators typically installed on Beechcraft, Grumman, Mooney and Vulcanair, S.P.A. Airplanes fitted with Lycoming Engines.

The Plane-Power AL24-P70 should be consider as a direct replacement for the following:

  • Beechcraft Part Number: ALU-8421
  • Beechcraft Part Number: ALU-8421R
  • Grumman (Gulfstream, Tiger) Number: ALU8421LS
  • Mooney Part Number:
  • Mooney Part Number: ALU6421LS
  • Mooney Part Number: ES-4009LS
  • Vulcanair, S.P.A. Part Number: ALU-8421LS

    Please use the "Application" to see if your planes model is listed.

  • 24/28 volt
  • 70 amp
  • Weight: 9 Pounds, 12.8 Ounces
  • Warranty: 2-Year Limited
    • The Plane-Power AL24-P70 is FAA-PMA approved for installation on the following:

    Beechcraft

  • B19, C19, C24R
  • 76 Duchess
  • 77Skipper

    Grumman (Gulfstream, Tiger)AG-5B

    Mooney

  • M20J, M20M

    Vulcanair, S.P.A.

  • P68, P68B, P68C, P68C-TC, P68 "OBSERVER", P68TC "OBSERVER", P68 "OBSERVER 2"

    Lycoming Engine series 235, 320, 360, 540, 720

  • Replacement for 24v 70 amp (or less) Lycoming alternators
    • Installation Instructions

    1. Disconnect aircraft battery.
    2. Install alternator per included drawing.
    3. Refer to appropriate engine and airframe service manuals for belt tension and bolt torques.
    4. Install battery wire with MS25171-2S terminal nipple on 6mm output terminal and torque to 50 in. lb.
    5. Install ground wire to any of the three 5mm studs on rear of alternator and torque to 35 in. lb.
    6. Install field wire with MS25171-1S terminal nipple to F1 terminal on rear of alternator and torque to 20 in. lb.
    7. NOTE: F2 terminal to remain grounded with ground strap UNLESS aircraft voltage regulator is a type "A" regulator using a 2-wire field circuit, in this case remove and discard ground strap from F2 terminal and connect wiring from voltage regulator to F1 and F2 terminals, torque to 20 in. lb.
    8. If aircraft is equipped with an "alternator out light" circuit, connect that wire to the AUX terminal and torque to 20 in. lbs. Other wise leave AUX terminal open.
    9. Reconnect aircraft battery.
    10. Start aircraft and check alternator output for proper operation.

    Instructions For Continued Airworthiness

    Annual / 100 hour inspections

    1. Remove drive belt and turn alternator rotor to check condition of bearings for abnormal noise or roughness.

    5 year or 1,000 hour intervals
    1. Repeat: Annual / 100 hour inspection.
    2. Remove field brush assembly and inspect brushes for excess wear. Replace brush assembly if brushes extend less than .250" from edge of brush holder case.
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