ARCO Zeus A275L High Output Alternator

Price
$1,136
Housing:
Regulation:
Ground Type:
Description

High Output / High Amperage Alternator: The Highest Power Output in Its Class

  • Replace your noisy generator!
  • Engineered for high energy production.
  • Suitable for marine, RV, military, and commercial applications.
  • Rapidly charges large battery banks.
  • Coolest operating temperatures for increased performance:
    • Heat shedding coatings
    • Rectifier located on housing exterior
    • Dual cooling fans
    • OEM components
  • Optimized for performance at idle speeds.
  • Reduces the need for a generator by creating additional power with your engine.
  • Unleash peak performance with E-Coat/Cerakote, keeping the A275L cooler for sustained amperage output.
  • For maximum performance or lithium battery charging, use the ARCO Zeus Bluetooth Alternator Regulator.
  • Mercedes requires the use of a clutch pulley on secondary alternators used on all Sprinter vans. For Mercedes Sprinter, please use our N62 with Clutch Pulley here.
  • SAE J1171 Certified.
  • Models available with internal/external voltage regulator.
  • Proudly made in the U.S.A.
Technical Specifications

Voltage 12V
Field Type P
Rotor Poles 16
Stator Size 138mm
Frame Size Large
Weight 14.9 lbs / 6.7 kg
Regulation Internal/External (IE) or
External Only (EX)
Output Voltage 14.1V (default)
Finish (Black) Cerakote or E-coating
Cut-In RPM 1,061 Alternator RPM
Maximum Alt RPM 19,000
Battery Post M8 Thread Post, Side Mount
Standard Pulley 49K6 (6-groove, 49mm)
Pulley Mount 17mm diameter shaft, 25mm long, threaded M17 x 1.5
Pulley Hardware M17 x 1.5 x 24mm nut, w/ 18mm ID x 29mm OD washer (Included)
Diodes 6 positive, 6 negative, 50A Rated, Avalanche
Max Output (Cold, 9,000 RPM) 311 Amps
Sustained Cruising Output
(Hot, 6,000 RPM)
227 Amps
Sustained Idle Output
(Hot, 3,000 RPM)
198 Amps
Max Continuous Operating Temperature 110°C / 230°F

Mounting Options and Applications

Mounting ARCO Part Number Application
1-2” Single Foot 4027
4028
4029
4030
Replaces most domestic styles using a single 1" or 2" mounting foot
(e.g., Motorola, Prestolite).
Requires Standard single "V" belt upgrading to a double "V" belt or Serpentine System
3.15” Saddle 4019 Replaces most small case styles using a 3.15" saddle style mount
(e.g., Hitachi, Lucas, Mitsubishi). Most Yanmars.
Requires Standard single "V" belt upgrading to a Serpentine System
3.15”R Saddle (Rear exit B+ post) 4020
4021
Must be used on Yanmar Common Rail introduced after 2013
(JH-CR, 3JH40, 4JH45, 4JH57, 4JH80, 4JH110)
4” J180 Saddle 4022
4023
4024
4025
Replaces most Volvo Penta alternators using a 4” J180 saddle style mount
Vortec 4033
4034
Replaces Mando type alternators using Vortec/GM pad mounting feet
(Found on many Mercruiser and Volvo Penta 3.0GLM, 3.0GLP, 4.3GXi, 5.7GiL, 5.7GXiL Marine Engines.)
(GM Blocks)
Transit 4031
4032
Replaces Ford Transit alternators for 3.5L & 3.7L Gas engines 2015-2022
N62 (Clutch Pulley) 4026 Mercedes Sprinter 1999-2006 alternators,
Mercedes Sprinter Factory dual alternator 2007-Up Replacement,
Replaces Roadtrek Mercedes Dual alternator

Regulation

External Only (EX): These units will come with a terminal block and a P-Type harness. They will only work with an external regulator, such as an ARCO Zeus Bluetooth alternator regulator.

Internal/External (IE): Internally regulated with adaptor for optional external regulation.

Transparency - How We Test For Output

To measure sustained output, the alternator is run at 3,000 RPMs for 60 minutes with a plexiglass shield covering the units. Testing shows that after 60 minutes in these conditions, alternators reach their maximum operating temperature, or the conditions under which the unit will produce the least output.

It is under these harsh conditions where we measure the “hot” output of the units at various RPMs. The complete power curve is shown above.

Note: The “hot” conditions are much less favorable than the conditions typically used in the industry. The temperature of the stator during our “hot” test was 305 °F. Incumbents measure the power curve at an ambient temperature of 140 °F. “Cold” testing was done at 71° F.

Cross-Reference

Unit Part #s Superceeded Part Number Voltage Size Housing Regulation Pulley APS Mechman Balmar
4019 A275L-12-DF315-EX-IG-49K6 12V Large (138mm) 3.15 External Only 49K6 360HSB1H652S9E4 - N/A
4020 A275L-12-DF315R-EX-49K6 12V Large (138mm) 3.15 Internal or External 49K6 - - XT-CR-250-K6
4022 A275L-12-DF4-EX-49K6 12V Large (138mm) 4.00 J180 External Only 49K6 42i-270-14JEXT/STA - N/A
4024 A275L-12-DF4-IE-49K6 12V Large (138mm) 4.00 J180 Internal or External 49K6 360HVOPRIG1H852S9E2 - XT-DF4-250-K6
4026 A275L-12-N62-EX-50K6CP 12V Large (138mm) N62 External Only 50K6CP 360HN621H652S9CE4 - XT-MS-250-K6
4027 A275L-I2-SF12-EX-49K6 12V Large (138mm) 1" Single Foot w/ 2" Spacer External Only 49K6 - - N/A
4029 A275L-I2-SF12-IE-49K6 12V Large (138mm) 1" Single Foot w/ 2" Spacer Internal or External 49K6 - - XT-SF-250-K6
4032 A275L-12-TR-EX-62K4 12V Large (138mm) Ford Transit External Only 62K4 - 11630320 XT-EB-250-K4
4033 A275L-12-VT-EX-49K6 12V Large (138mm) Vortec External Only 49K6 - - N/A
4034 A275L-12-VT-IE-49K6 12V Large (138mm) Vortec Internal or External 49K6 360H15RVC1H652S9C M8206250 XT-VT-250-K6

SKU Details

Voltage Maximum
Output (Amps)
Sustained Idle
Output (Amps)
Housing Regulation Pulley Release Date Unit Part #
12V 311 198 Vortec (GM) External Only 49mm K6 April, 2024 A275L-12-VT-EX-49K6
12V 311 198 Vortec (GM) Internal or External 49mm K6 April, 2024 A275L-12-VT-IE-49K6
12V 311 198 Ford Transit External Only 49mm K6 April, 2024 A275L-12-TR-EX-49K6
12V 311 198 Ford Transit Internal or External 49mm K6 April, 2024 A275L-12-TR-IE-49K6
12V 311 198 1"-2" Single Foot External Only 49mm K6 May, 2024 A275L-12-SF12-EX-49K6
12V 311 198 1"-2" Single Foot Internal or External 49mm K6 May, 2024 A275L-12-SF12-IE-49K6
12V 311 198 N62 External Only 49mm K6 May, 2024 A275L-12-N62-EX-49K6
12V 311 198 N62 Internal or External 49mm K6 May, 2024 A275L-12-N62-IE-49K6
12V 311 198 N62 External Only 50mm K6 Clutch Pulley May, 2024 A275L-12-N62-EX-50K6CP
12V 311 198 N62 Internal or External 50mm K6 Clutch Pulley May, 2024 A275L-12-N62-IE-50K6CP
12V 311 198 3.15" J180 External Only 49mm K6 June, 2024 A275L-12-DF315-EX-49K6
12V 311 198 3.15" J180 Internal or External 49mm K6 June, 2024 A275L-12-DF315-IE-49K6
12V 311 198 4" J180 External Only 49mm K6 June, 2024 A275L-12-DF4-EX-49K6
12V 311 198 4" J180 Internal or External 49mm K6 June, 2024 A275L-12-DF4-IE-49K6

Support and Downloads

ARCO Zeus A275 Alternator Datasheet

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ARCO Zeus Alternator Wiring Instructions

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ARCO Zeus High Output Alternator Testing Results

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