Specifications:
  • 78 Ampere Alternator

Fit guaranteed

  • This NEW alternator will install just as your original does.
  • Designed to fit your original engine brackets.
  • **NOTE: This alternator comes with a V-belt pulley as pictured. If your vehicle has a 6-groove pulley, you will have to remove and reuse your original pulley**.
  • Your existing wiring harness will attach with no modification.

Quality

    • This Alternator will give you trouble free performance
    • Each unit is individually tested.
      • You'll receive a report with your alternator that shows its performance.
  • New vs. Remanufactured
    • Nothing is more frustrating than pulling off the side of the road with a failed alternator. That is why we carry only new alternators which are 94% more reliable than remanufactured alternators.
    • Our Alternators are 100% NEW. Castings, pulleys, fans, hardware, internal parts, etc. are all new.
    • No Core Charge; No hassling with an old core
This replacement 78 Amp Alternator is just what you need to get your vehicle in good working order again. If your battery is no longer being charged completely, or at all, this Alternator may be the solution for you.

Ensure fit

  • Please verify the picture matches the alternator in your vehicle. If you think there is a difference please call us to toll free 888-844-3393 to verify fit.
  • For some vehicles we provide the VIN engine code to match. Match the 8th digit (5th digit on 1979 and earlier) of your VIN number to the VIN code in the title.
  • Examples
  • 1975 Buick Apollo Alternator 250ci (5th VIN Digit D) With A/C 63 Amp
    If you have a 1975 Buick Apollo you want to make sure the 5th digit of your VIN is D and you have Air Conditioning
    1973 Buick Centurion Alternator 455ci With A/C 63 Amp
    This alternator will fit a '73 Centurion with a 455 cubic inch engine and Air Conditioning.
  • Your vehicles VIN number can be found in the lower left corner of the windshield or on your registration.

Our electrical and electronic parts are subject to strict quality control testing. Please ensure proper diagnosis of this item before purchasing as the item cannot be returned once installed or plugged in.

Item Condition: New

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Disconnecting the Battery (0:56)
    • Disconnect the negative battery cable
  2. step : Accessing the Alternator (1:03)
    • Remove the thumbscrew from the air cleaner
    • Loosen the air cleaner hose clamp
    • Disconnect the air cleaner hose
    • Pull out the air cleaner
    • Remove the 1/4 inch bolt from the A/C line bracket
    • Pull the A/C lines aside
  3. step : Removing the Alternator (1:32)
    • Disconnect the alternator wiring harness
    • Remove the 10mm nut from the alternator battery lead
    • Disconnect the battery lead
    • Loosen the 9/16 inch bolt from the alternator
    • Loosen the 1/4 inch bolt from the alternator
    • Pull the belt from the alternator
    • Remove the nut from the back of the alternator
    • Remove the 9/16 inch bolt and the 1/4 inch bolt from the alternator
    • Pull the alternator up and out
  4. step : Preparing the New Alternator (3:38)
    • Transfer the bracket from the old alternator to the new one
    • Insert a T50 Torx bit into the alternator shaft on the new alternator
    • Remove the 15/16 inch nut from the new alternator
    • Remove the pulley from the new alternator
    • Remove the pulley from the old alternator and transfer it to the new one
    • Match the position of the post on the new alternator to the old one
    • For more detailed instructions on changing the post position, please see our other videos
  5. step : Installing the New Alternator (5:23)
    • Put the new alternator into place
    • Start the 9/16 inch bolt into the alternator
    • Start the 1/4 inch bolt into the alternator
    • Fasten the nut onto the back of the alternator
    • Connect the alternator wiring harness
    • Connect the battery lead
    • Fasten the nut onto the battery lead
    • Put on the battery lead boot
    • Pull the belt onto the alternator
    • Pull the alternator up with a pry bar to tighten the belt
    • Tighten the two bolts into the front of the alternator
  6. step : Reconnecting the Battery (6:45)
    • Reconnect the negative battery cable
  7. step : Reinstalling the Air Cleaner (9:13)
    • Put the A/C lines onto their bracket
    • Insert the bolt into the A/C line bracket
    • Put the air cleaner into place
    • Connect the air cleaner hose
    • Tighten the air cleaner hose clamp
    • Fasten the thumbscrew onto the air cleaner

Tools needed for replacement:

    Ratchets & Related

  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver
  • Pry Bar

  • Sockets - Metric

  • 10mm Socket
  • 15mm Socket
  • 11mm Socket
  • 14mm Socket
  • 12mm Socket
  • 13mm Socket

  • Sockets - SAE

  • 1/2 Inch Socket
  • 7/16 Inch Socket
  • 9/16 Inch Socket

  • Wrenches - Metric

  • 15mm Wrench
  • 13mm Wrench
  • 11mm Wrench
  • 12mm Wrench
  • 14mm Wrench
  • 10mm Wrench

  • Wrenches - SAE

  • 9/16 Inch Wrench
  • 7/16 Inch Wrench
  • 1/2 Inch Wrench

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Vehicle Fit

Year Make Model Description
1985Chevy Astro Chevy Astro Alternator 66-78 Amp
1983-1990Chevy Blazer Full Size Chevy Blazer Full Size Alternator 66-78 Amp
1983-1986Chevy C10 Truck Chevy C10 Truck Alternator 66-78 Amp
1983-1986Chevy C20 Truck Chevy C20 Truck Alternator 66-78 Amp
1983-1986Chevy C30 Truck Chevy C30 Truck Alternator 66-78 Amp
1983-1987Chevy Caprice Chevy Caprice Alternator 66-78 Amp
1983-1985Chevy El Camino Chevy El Camino Alternator 66-78 Amp
1983-1990Chevy G10 Chevy G10 Alternator 66-78 Amp
1983-1990Chevy G20 Chevy G20 Alternator 66-78 Amp
1983-1990Chevy G30 Chevy G30 Alternator 66-78 Amp
1983-1985Chevy Impala Chevy Impala Alternator 66-78 Amp
1983-1986Chevy K10 Truck Chevy K10 Truck Alternator 66-78 Amp
1983-1986Chevy K20 Truck Chevy K20 Truck Alternator 66-78 Amp
1983-1986Chevy K30 Truck Chevy K30 Truck Alternator 66-78 Amp
1983Chevy Malibu Chevy Malibu Alternator 66-78 Amp
1983-1985Chevy Monte Carlo Chevy Monte Carlo Alternator 66-78 Amp
1983-1989Chevy P20 Chevy P20 Alternator 66-78 Amp
1983-1990Chevy P30 Chevy P30 Alternator 66-78 Amp
1983-1986Chevy Suburban C10 Chevy Suburban C10 Alternator 66-78 Amp
1983-1986Chevy Suburban C20 Chevy Suburban C20 Alternator 66-78 Amp
1983-1986Chevy Suburban K10 Chevy Suburban K10 Alternator 66-78 Amp
1983-1986Chevy Suburban K20 Chevy Suburban K20 Alternator 66-78 Amp
1983-1991GMC C1500 Truck GMC C1500 Truck Alternator 66-78 Amp
1983-1991GMC C2500 Truck GMC C2500 Truck Alternator 66-78 Amp
1983-1991GMC C3500 Truck GMC C3500 Truck Alternator 66-78 Amp
1983-1985GMC Caballero GMC Caballero Alternator 66-78 Amp
1983-1990GMC G1500 GMC G1500 Alternator 66-78 Amp
1983-1990GMC G2500 GMC G2500 Alternator 66-78 Amp
1983-1990GMC G3500 GMC G3500 Alternator 66-78 Amp
1983-1990GMC Jimmy Full Size GMC Jimmy Full Size Alternator 66-78 Amp
1983-1991GMC K1500 Truck GMC K1500 Truck Alternator 66-78 Amp
1983-1991GMC K2500 Truck GMC K2500 Truck Alternator 66-78 Amp
1983-1991GMC K3500 Truck GMC K3500 Truck Alternator 66-78 Amp
1983-1989GMC P2500 GMC P2500 Alternator 66-78 Amp
1983-1990GMC P3500 GMC P3500 Alternator 66-78 Amp
1985GMC Safari GMC Safari Alternator 66-78 Amp
1983-1986GMC Suburban C1500 GMC Suburban C1500 Alternator 66-78 Amp
1983-1986GMC Suburban C2500 GMC Suburban C2500 Alternator 66-78 Amp
1983-1986GMC Suburban K1500 GMC Suburban K1500 Alternator 66-78 Amp
1983-1986GMC Suburban K2500 GMC Suburban K2500 Alternator 66-78 Amp
1987-1990GMC Suburban R1500 GMC Suburban R1500 Alternator 66-78 Amp
1987-1990GMC Suburban R2500 GMC Suburban R2500 Alternator 66-78 Amp
1987-1990GMC Suburban V1500 GMC Suburban V1500 Alternator 66-78 Amp
1987-1990GMC Suburban V2500 GMC Suburban V2500 Alternator 66-78 Amp
1983-1985Jeep CJ8 Scrambler Jeep CJ8 Scrambler Alternator 66-78 Amp
1986Pontiac Bonneville Pontiac Bonneville Alternator 66-78 Amp
1983-1986Pontiac Parisienne Pontiac Parisienne Alternator 66-78 Amp

This part replaces:

  • Lester 7273-12
Part #: 1AEAL00050

Out of Stock

How-to Video:

(09:54 min)