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ARCO Zeus A225/3500W-12V (A225S) High Output Alternator, 1"-2" Single Foot, Isolated Ground (4016)

Model: 4016 · SKU: 4016

Prepared Nov 12, 2026

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Common specifications

Rated output current	254 ASource [2, 3]
Sustained output current	157 ANeeds confirmationSource See note below[2, 3]
System voltage	12 VSource [2, 3]
Rotation	Not documented
Ground type	Isolated GroundSource [2]
Mounting	1”-2” Single FootSource [2]
Pulley	49mm K6 (6 groove)Source [2]
Cut-in speed (RPM)	1,061 RPMNeeds confirmationSource See note below[3]
Maximum speed (RPM)	19,000 RPMSource [3]
Stator size	130 mm5.12 in convertedSource [3]
Regulator included	External OnlyNeeds confirmationSource See note below[2]
Cooling	Dual cooling fansSource [2, 3]
Efficiency	Not documented
Operating temperature	110 M °CSource [2]
Weight	Not documented
Dimensions	Not documented
Enclosure volume	Not documented
Warranty term	Not documented

All recorded specifications

Cooling	Dual cooling fansDocumented claim Conditions Printed as "Dual cooling fans" on ARCO's product page and "Dual Cooling fans" in the brochure's High Output Alternators list, which covers every Zeus high output alternator. Location: Product page description, "Coolest operating temperatures" list; brochure, High Output Alternators list Printed as "Dual cooling fans" on ARCO's product page and "Dual Cooling fans" in the brochure's High Output Alternators list, which covers every Zeus high output alternator. Location: Product page description, "Coolest operating temperatures" list; brochure, High Output Alternators list Official product page · ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture)Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2, 3]
Cut-in speed (RPM)	1,061 RPMNeeds confirmationARCO's A225S product page prints "Cut-In RPM 1,061 Alternator RPM"; the brochure's Specifications table prints 1,196 in its A225s-12V column. ARCO's installation manual prints no cut-in speed, and neither document names a revision that supersedes the other. Conditions Printed as "Cut-In RPM 1,061 Alternator RPM" in the A225S-12V product page's Technical Specifications, which cover every part number of the page. The brochure's two-column A225s-12V and A275L-12V table prints "Cut-In Alt. RPM 1,061 1,196"; its column headings do not match the order of its figures, so it is not used for either model. Location: Product page, Technical Specifications, Cut-In RPM row Printed as "Cut-In RPM 1,061 Alternator RPM" in the A225S-12V product page's Technical Specifications, which cover every part number of the page. The brochure's two-column A225s-12V and A275L-12V table prints "Cut-In Alt. RPM 1,061 1,196"; its column headings do not match the order of its figures, so it is not used for either model. Location: Product page, Technical Specifications, Cut-In RPM row Official product page · ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture) [3]
Ground type	Isolated GroundDocumented claim Conditions Printed in the Ground Type column of the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016". Location: Brochure, A225s-12V DETAILS table, Ground Type column for part 4016 Printed in the Ground Type column of the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016". Location: Brochure, A225s-12V DETAILS table, Ground Type column for part 4016 Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Maximum speed (RPM)	19,000 RPMDocumented claim Conditions Printed as "Maximum Alt RPM 19,000" in the A225S-12V product page's Technical Specifications. Location: Product page, Technical Specifications, Maximum Alt RPM row Printed as "Maximum Alt RPM 19,000" in the A225S-12V product page's Technical Specifications. Location: Product page, Technical Specifications, Maximum Alt RPM row Official product page · ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture) [3]
Mounting	1”-2” Single FootDocumented claim Conditions The housing (mount) ARCO's brochure prints for part 4016, row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016"; ground type Isolated Ground, pulley 49mm K6 (6 groove). Location: Brochure, A225s-12V DETAILS table, Housing column for part 4016 The housing (mount) ARCO's brochure prints for part 4016, row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016"; ground type Isolated Ground, pulley 49mm K6 (6 groove). Location: Brochure, A225s-12V DETAILS table, Housing column for part 4016 Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Operating temperature	110 M °CDocumented claim Conditions The product page prints no operating temperature; the brochure's two-column A225s-12V and A275L-12V Specifications print "Max Continuous Operating Temperature 110°C/230°F 110°C/230°F", the same figure for both models. ARCO prints a maximum continuous operating temperature only, no lower limit. Location: Brochure, A275L-12V and A225s-12V Specifications, Max Continuous Operating Temperature row The product page prints no operating temperature; the brochure's two-column A225s-12V and A275L-12V Specifications print "Max Continuous Operating Temperature 110°C/230°F 110°C/230°F", the same figure for both models. ARCO prints a maximum continuous operating temperature only, no lower limit. Location: Brochure, A275L-12V and A225s-12V Specifications, Max Continuous Operating Temperature row Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Pulley	49mm K6 (6 groove)Documented claim Conditions Printed in the Pulley column of the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016". Location: Brochure, A225s-12V DETAILS table, Pulley column for part 4016 Printed in the Pulley column of the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016". Location: Brochure, A225s-12V DETAILS table, Pulley column for part 4016 Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Rated output current	254 ADocumented claim Conditions The maximum output current ARCO prints for part 4016: its brochure's A225s-12V DETAILS table row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016" (Maximum Output column 254), and the product page's Technical Specifications row "Max Output (Cold, 9,000 RPM) 254 Amps". Maximum output is the cold figure at 9,000 alternator RPM. The product page prints "Sustained Cruising Output (Hot, 6,000 RPM) 187 Amps" and "Sustained Idle Output (Hot, 3,000 RPM) 157 Amps". ARCO says "cold" testing was done at 71 °F and measures "hot" output after 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A225s-12V DETAILS table, row for part 4016; product page, Technical Specifications, Max Output row The maximum output current ARCO prints for part 4016: its brochure's A225s-12V DETAILS table row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016" (Maximum Output column 254), and the product page's Technical Specifications row "Max Output (Cold, 9,000 RPM) 254 Amps". Maximum output is the cold figure at 9,000 alternator RPM. The product page prints "Sustained Cruising Output (Hot, 6,000 RPM) 187 Amps" and "Sustained Idle Output (Hot, 3,000 RPM) 157 Amps". ARCO says "cold" testing was done at 71 °F and measures "hot" output after 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A225s-12V DETAILS table, row for part 4016; product page, Technical Specifications, Max Output row Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official product page · ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture) [2, 3]
Regulator included	External OnlyNeeds confirmationARCO's brochure prints part 4016 as External Only; ARCO's product page and store option print it as Internal or External. Neither names a revision that supersedes the other. Conditions ARCO's brochure prints the regulation of part 4016 as "External Only" (row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016"). The product page explains: "These units will come with a terminal block and a P-Type harness. They will only work with an external regulator". A regulator is not part of an External Only unit; ARCO names its Zeus Bluetooth regulator for these. Location: Brochure, A225s-12V DETAILS table, Regulation column for part 4016; product page, Regulation notes ARCO's brochure prints the regulation of part 4016 as "External Only" (row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016"). The product page explains: "These units will come with a terminal block and a P-Type harness. They will only work with an external regulator". A regulator is not part of an External Only unit; ARCO names its Zeus Bluetooth regulator for these. Location: Brochure, A225s-12V DETAILS table, Regulation column for part 4016; product page, Regulation notes Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture) [2]
Stator size	130 mm5.12 in convertedDocumented claim Conditions Printed as "Stator Size 130mm" in the A225S-12V product page's Technical Specifications. Location: Product page, Technical Specifications, Stator Size row Printed as "Stator Size 130mm" in the A225S-12V product page's Technical Specifications. Location: Product page, Technical Specifications, Stator Size row Official product page · ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture) [3]
Sustained output current	157 ANeeds confirmationARCO's brochure and the product page's Technical Specifications print 157 A sustained idle output for the A225S; the page's SKU Details table prints 187 A for part 4016. Conditions The sustained idle output ARCO prints for part 4016: the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016" (Sustained Idle Output column 157; its footnote reads "3,000 alternator RPM sustained under load and hot conditions for 1 hour.") and the product page's "Sustained Idle Output (Hot, 3,000 RPM) 157 Amps". The page also prints "Sustained Cruising Output (Hot, 6,000 RPM) 187 Amps". ARCO measures "hot" output after the alternator has run 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A225s-12V DETAILS table, Sustained Idle Output column for part 4016; product page, Technical Specifications, Sustained Idle Output row The sustained idle output ARCO prints for part 4016: the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016" (Sustained Idle Output column 157; its footnote reads "3,000 alternator RPM sustained under load and hot conditions for 1 hour.") and the product page's "Sustained Idle Output (Hot, 3,000 RPM) 157 Amps". The page also prints "Sustained Cruising Output (Hot, 6,000 RPM) 187 Amps". ARCO measures "hot" output after the alternator has run 60 minutes at 3,000 RPM under a plexiglass shield. Location: Brochure, A225s-12V DETAILS table, Sustained Idle Output column for part 4016; product page, Technical Specifications, Sustained Idle Output row Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official product page · ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture) [2, 3]
System voltage	12 VDocumented claim Conditions Printed as "Voltage 12V" in the product page's Technical Specifications and as the Voltage column of the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016". Location: Brochure, A225s-12V DETAILS table, Voltage column; product page, Technical Specifications, Voltage row Printed as "Voltage 12V" in the product page's Technical Specifications and as the Voltage column of the brochure row "12V 254 157 1”-2” Single Foot External Only Isolated Ground 49mm K6 (6 groove) 4016". Location: Brochure, A225s-12V DETAILS table, Voltage column; product page, Technical Specifications, Voltage row Official document · ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official product page · ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture) [2, 3]

Warranty

Certificate records

No records documented.

Sources and revisions

ARCO Zeus Alternator Installation Guide 2025 (TECH-001 REV-B 8/18/25, arcomarine.com, October 29, 2026 capture)Official installation manual · Revision TECH-001 REV-B · 2025-08-18 · Checked Oct 26, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/TECH-001_ARCO_Zeus_Alternator_Installation_Guide_2025.pdf?v=1755639945
ARCO Zeus High Energy Collection brochure: Bluetooth Alternator Regulator & High Output Alternators (v2, arcomarine.com, October 27, 2026 capture)Official document · Revision 1001 Cat 1 Rev A · Checked Oct 26, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/The_ARCO_Zeus_Collection_Brochure_v2_488a3d13-7f71-461e-8999-4f88397839fc.pdf?v=1762453970
ARCO Marine product page: ARCO Zeus A225/3500W-12V (A225S) High Output Alternator (arcomarine.com, October 27, 2026 capture)Official product page · Checked Oct 26, 2026https://arcomarine.com/products/arco-zeus-a225s
ARCO Zeus High Output Alternator Wiring Connection Instructions (TECH001 - REV001 7/31/25, arcomarine.com, October 29, 2026 capture)Official document · Revision TECH001 - REV001 · 2025-07-31 · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/ARCO_Zeus_Alternator_insert_2025_V3.pdf?v=1754409647
ARCO Zeus Alternator & Regulator OEM Troubleshooting Guide (TECH-002 REV-A 7/31/25, arcomarine.com, October 29, 2026 capture)Official instruction manual · Revision TECH-002 REV-A · 2025-07-31 · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/TECH-002_ARCO_Zeus_Alternator_Regulator_OEM_Troubleshooting_Guide.pdf?v=1755639958
ARCO Zeus Installation Audit v1.0 (TECH-004 REV-A 7/31/2025, arcomarine.com, October 29, 2026 capture)Official instruction manual · Revision TECH-004 REV-A · 2025-07-31 · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/TECH-004_ARCO_Zeus_Installation_Audit_v1.0.pdf?v=1755639979
ARCO Zeus High Energy Collection brochure (file The_ARCO_Zeus_Collection_Brochure.pdf, arcomarine.com, October 29, 2026 capture)Official document · Revision 1001 Cat 1 Rev A · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/The_ARCO_Zeus_Collection_Brochure.pdf?v=1743020364
High Output Alternator Performance Testing (ARCO Marine, "Updated: 5/10/2024", arcomarine.com, October 29, 2026 capture)Official document · Checked Oct 29, 2026https://cdn.shopify.com/s/files/1/0110/9521/2098/files/ARCO_Zeus_High_Output_Alternator_Testing_Results_93023fc1-b11e-4181-9ad0-8b24e3e4ccca.pdf?v=1729633064.pdf