ARCO Zeus A275L High Output Alternator

Price
$1,136
Housing:
Regulation:
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 A275L-12-SF12-EX-49K6
A275L-12-SF12-IE-49K6
Replaces most domestic styles using a single 1or 2”mounting foot
(e.g., Motorola, Prestolite).
3.15” J180 Saddle A275L-12-DF315-EX-49K6
A275L-12-DF315-IE-49K6
Replaces most small case styles using a 3.15” J180 saddle style mount
(e.g., Hitachi, Lucas, Mitsubishi) Most Yanmars.
4” J180 Saddle A275L-12-DF4-EX-49K6
A275L-12-DF4-IE-49K6
Replaces most Volvo Penta alternators using a 4” J180 saddle style mount
Vortec/GM A275L-12-VT-EX-49K6
A275L-12-VT-IE-49K6
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 )
N62 A275L-12-N62-EX-49K6
A275L-12-N62-IE-49K6
Replaces most Mercedes and BMW alternators
Transit A275L-12-TR-EX-49K6
A275L-12-TR-IE-49K6
Replaces Ford Transit alternators 3.5L & 3.7L Gas engines 2015-2022
N62 (Clutch Pulley) A275L-12-N62-EX-50K6CP
A275L-12-N62-IE-50K6CP
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

 ARCO Zeus A275L APS Mechman Balmar
A275L-12-DF315-EX-49K6 360HSB1H652S9E4 - -
A275L-12-DF315-IE-49K6 - - XT-DF-250-K6
A275L-12-DF4-EX-49K6 42I-270-14JEXT/STA - -
A275L-12-DF4-IE-49K6 360HVOPRIG1H852S9E2
XT-DF4-250-K6
A275L-12-N62-EX-49K6 360HN621H652S9CE4 - -
A275L-12-N62-IE-49K6 - - XT-MS-250-K6
A275L-12-SF12-EX-49K6 - - -
A275L-12-SF12-IE-49K6 - - XT-SF-250-K6
A275L-12-TR-EX-49K6 - - -
A275L-12-TR-IE-49K6 - 11630320 XT-EB-250-K4
A275L-12-VT-EX-49K6 - - -
A275L-12-VT-IE-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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