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858839 Marine

Alternator

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OEM interchange

Other OEM part numbers for the same part — order from any of these makers or their dealers.

Same component rebadged by another engine marque — often the same part at a different dealer counter.

Equivalent P/NBrandDescriptionSourceConfidenceShop
66021151M Prestolite Prestolite PN in same Valeo marine cluster - depth:alternators sterndrivereplacement.com likely
A13N147M Valeo OEM-base Valeo A13N147M/A13N148M/A13N1M/A13N2M cited on Sierra 18-5959 card - depth:alternators fredwarner.net likely

Aftermarket equivalents cross-ref

Third-party equivalents (Jabsco, Sierra, WIX, Mann…) — not OEM; verify before ordering. Usually cheaper than the marine dealer.

Equivalent P/NBrandDescriptionSourceConfidenceShop
80108 ARCO ARCO lists 55A Delco-style 2in foot; replaces 841765/858838/872018; amp 55 vs Sierra 50 — verify; pulley NOT included - depth:alternators boundlessoutfitters.com likely
18-5959 Sierra EMP listing groups 841380 with 841765 and Sierra 18-59700 — Sierra PN conflict 18-5959 vs 18-59700; treat likely and verify card - depth:alternators fredwarner.net; obparts.com; schmarine.com; sterndrivereplacement.com likely
8902N WAI WAI new 50A Valeo-style; Lester 13068/14052; pulley not included - depth:alternators sterndrivereplacement.com likely

Used in 3 places

Every catalog figure this part is placed in, the model(s) it applies to, and its reference/level/quantity.

Model(s)CatalogFigurePageRefLevQty
MD11, MD11C, MD11D, MD17, MD17C, MD17D https://powerproductsystems.com/engines-live/marine-diesel-engines/7742230.html Fig 15135. Alternator: 841762 1 1
MD5A, MD5B, MD5C https://powerproductsystems.com/engines-live/marine-diesel-engines/7742220.html Fig 15018. Alternator: 841762 1 1
MD6, MD6A, MD6B, MD7, MD7A, MD7B https://powerproductsystems.com/engines-live/marine-diesel-engines/7742080.html Fig 13655. Alternator: 841762 1 1