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170 amp High Output Marine alternator to replace 20827 11SI ***BSTOCK ***

170 amp High Output Marine alternator to replace 20827 11SI ***BSTOCK *** IS-M20827170-BSTOCK mechman-bstock

170 amp High Output Marine alternator to replace 20827 11SI ***BSTOCK ***

Was: $519.00
Now: $467.10
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SKU:
IS-M20827170-BSTOCK
Availability:
Estimated lead time of 1-2 business days.
Weight:
18 LBS
VIP Shipping Options Available

*Attention!* This is a B-Stock, Display or Show Product

Mechman B-Stock alternators are factory-refurbished units that may have been lightly used, returned, or reconditioned. They may show minor cosmetic imperfections like scratches or finish blemishes but are fully tested to meet Mechman’s strict performance and reliability standards. These units deliver the same high-output performance as new alternators at a reduced price.

Ships in 7–10 business days (processing). “In Stock” means available in our inventory; it does not mean same-day shipping.

Warranty: B-Stock alternators include a 90-Day Functional Warranty only. Warranty covers performance (not cosmetics or labor), is non-transferable, and all sales are final — no returns or exchanges. An optional extended warranty is available beginning at $49.00.

Restrictions: No Modifications Allowed. No paint, pulley swaps, clocking, harness changes, or regulator upgrades. If customization is required, please purchase a new retail alternator.

Pricing: Standardized B-Stock pricing applies to all orders (web or phone). Not eligible for promotions, dealer/distributor discounts, or codes.

Returns/Warranty page add: B-Stock Alternators: 90-Day Functional Warranty only (performance coverage; cosmetic imperfections and labor are not covered). Warranty is non-transferable. All B-Stock sales are final no returns or exchanges.

This high output alternator features late model 6-phase hairpin stator technology in a custom machined housing that bolts directly in place of the antiquated 11SI design. Don't be fooled by cheap re-winds advertised as making 150-200 amps in the original 11SI housing! Our 11SI upgrade has (12) huge press fit diodes, instead of the (6) small diodes used in a standard 11SI. The MechMan 170 amp unit has twin, solid copper rectifier plates with 200%+ more surface area to dissipate heat, as in comparison to the 11SI aluminum rectifier design. Hairpin stator technology allows this unit to crank out much more output at idle than anything 11SI based, over 120 amps at engine idle RPM! This alternator is certified to meet or exceed SAE J1171, ISO 8846, and USCG Title 33 standards for ignition protection. 

Simply check the technical drawing in this listing against the measurements of your original alternator to verify fitment. All MechMan marine alternators are made in the USA, and feature a 1 year limited warranty. MechMan marine units are hard black anodized, THEN grey enamel coated to provide the best possible corrosion resistance.