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LActrical
LActrical High Output 300A Alternator

LActrical High Output 300A Alternator

Best price now

$259.99at AmazonChecked 1 h ago

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Price facts

  • Lowest price today: $259.99 at Amazon (checked Nov 10, 2026).

Our take on the LActrical High Output 300A Alternator

The LActrical High Output 300A Alternator is a large-case aftermarket alternator rated at 300 amps and 14 volts, aimed at vehicles with heavy electrical loads. It uses a six-groove serpentine pulley and a two-pin regulator plug, and weighs about 17 pounds. That output is far above most stock alternators, which typically run 100 to 150 amps, so it suits big audio systems, winches and dual-battery setups. The trade-off is that high-output alternators of this type often need upgraded charge cables and can be noisy or short-lived under constant full load.

Best forCar audio builds with large amplifiersTrucks with winches or dual batteriesWork vehicles with lights and accessoriesOwners replacing a failed stock alternator with extra capacity
Pros
  • 300-amp rating gives far more headroom than stock units
  • 14-volt output suits charging and accessory loads
  • Six-groove serpentine pulley fits many late-model belt setups
  • Two-pin regulator plug matches common GM-style wiring
  • About 17 pounds, manageable for a high-output unit
Cons
  • Retail amperage claims are often peak, not continuous
  • Large-case size may not fit tight engine bays
  • May need heavier charge cables and a bigger belt
  • Little independent test data on output and durability

LActrical High Output 300A Alternator prices at every store

  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $259.99+ $26.25 shippingChecked 1 h ago
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LActrical High Output 300A Alternator price history

Lowest price we've seen: $259.99 on Nov 11 at Amazon. Tracked across 1 store since Nov 11.

Specifications

Audio RMS support
not published
Output
300 Amps, retail claim
Voltage
14 volts, retail listing
Voltage Regulation
two-pin regulator plug listed
Pulley
six-groove serpentine, retail listing
Weight
17 LBS, cross-checked retail figure
Amperage
300 A

Questions and answers

Is 300 amps real or a peak rating?
Alternator ratings are often measured at a favorable rpm and cold temperature. Expect continuous output at idle to be well below 300 amps, so size your loads for realistic cruising rpm.
Will it fit my car?
Fit depends on the case size, mounting ears and pulley offset, not just the amperage. Compare the listing's case dimensions and clock position with your stock alternator before ordering.
Do I need to upgrade wiring?
Yes, in most cases. A 300-amp unit can exceed the capacity of stock charge cables and fusible links, so plan on a heavier charge wire and a properly rated fuse.
What belt does it use?
It has a six-groove serpentine pulley. Check that your engine uses a six-rib belt and that the pulley diameter matches your stock unit so belt length stays correct.
Does it work with my voltage regulator?
It uses a two-pin regulator plug, common on many GM applications. Confirm your harness connector matches and that the alternator is internally regulated as your vehicle expects.
Is it good for a daily driver?
It can be, but high-output alternators often run hotter and noisier than stock. For a mostly stock vehicle, a standard-output replacement is usually simpler and more reliable.
Where is the LActrical High Output 300A Alternator cheapest?
At Amazon, for $259.99, as of our latest check.

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