ARCO Marine Premium Replacement Outboard Alternator w/Multi-Groove Pulley - 12V 50A [20850]

ARCO Marine Premium Replacement Outboard Alternator w/Multi-Groove Pulley - 12V 50A [20850]

Marsoni

M251S

$206.50

Get it in 3 business days with 1 day shipping. Friday, May 29

ARCO Marine Premium Replacement Outboard Alternator w/Multi-Groove Pulley - 12V 50A [20850]Premium Replacement Outboard Alternator with Multi Groove Pulley 12V 50A Replacement alternator that will fit 1. 5L & 3. 0L Mercury Outboard, 12 Volt, 50 AMP, Internal Fan, Multi groove serpentine pulley included, Includes wire plug connector. Features: All alternators are engineered for performance and reliability All alternators are engineered and manufactured with precision and quality All alternators must meet or exceed OEM performance before

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We offer a 30-day return/exchange service after receiving.
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Bonded to services well, completely removed panel reverberation in my tacoma. Also really made the doors so much quieter even when closing. Very happy with the result. Used only one set on my 01 tacoma 4 door. Installed inside doors on exterior skin panel, over interior door panel access holes (sealing the door to provide backpressure to door speakers (left drains open)), roof panel, and back wall of cab. Achieved about 70% coverage and am very happy. 2 8in SKAR SVR8 at 1oh on walmart power acustic 2500 (only rated to ~800rms at 2oh, forum showed testing at 1oh worked about 1kw) in 6th order with blow through into cab. With cab gain, im over 130db between ~30 and ~50hz. This was a necessary addition!

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Reviewed in the United States on April 13, 2026

Verified Purchase

Rob Chapman

Alexandria, US

★★★★★ 5

Nice and sticky

Works as it should. No complaints.

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Reviewed in the United States on May 8, 2026

Verified Purchase

Nick Wilson

Chelsea, US

★★★★★ 5

Mak sure area is clean before you install

This works amazing, easy to use, great quality. Sticks down great, I will be ordering more for sure.

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Reviewed in the United States on April 29, 2026

Sam

Bozeman, US

★★★★★ 3

Looks good so far, will update once installed

Have not installed this yet, so this is only a first impression review. I bought it to use in the wheel well area on my truck, so I’ll update later once I actually get it on and see if it makes a real difference. So far it looks good out of the box and seems straightforward enough. One thing I’d recommend is making sure you have a sound deadening roller for install, because I would not try putting this on without one. Too early for me to say how well it works for road noise since it is not installed yet, but I wanted to post my initial thoughts for now and will update later.

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Reviewed in the United States on April 2, 2026