# 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 being boxed

**Warranty Information:**

When properly installed, all ARCO products are warrantied against defects in materials and workmanship for a period of 12 months for leisure use and 90 days for commercial or racing applications. 

Add an extra year of warranty to your rotating electric ARCO product (Tilt/Trim Motors, Alternators, Outboard Starters, and Inboard Starters) when you register your product within 30 days of purchase. You can register your product by visiting arcomarine.com/product-registration 

**Replaces:**

DELCO Alternator 8600514  
DELCO Alternator 19020704  
DELCO Alternator 19020707  
MERCURY Alternator 8M0064020  
MERCURY Alternator 8M6000803  
MERCURY Alternator 828506  
MERCURY Alternator 875286A-1  
MERCURY Alternator 881247A1  
MERCURY Alternator 889956  
SIERRA Alternator 18-6455  
PROTORQUE Alternator PH300-0031  
PROTORQUE Alternator PH200-T010  
PROTORQUE Alternator PH200-T015  
PROTORQUE Alternator PH200-T016  
MPPARTS Alternator TRM0009  
MPPARTS Alternator TRM0066

**This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.**

**Specifications:**

-   Amperage: 50A
-   Voltage: 12v
-   Box Dimensions: 8"H x 8"W x 9"L WT: 7.3 lbs
-   UPC: 693006008219

  
[Quick Guide (pdf)](https://productimageserver.com/literature/quickGuide/97207QG.pdf)

## Details

- **Price:** 521.01 USD
- **Type:** Alternators
- **Tags:** Brand_ARCO Marine, Clearance, Engine Parts & Service, Engine Parts & Service | Alternators, Specials

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 521.01 USD | In stock |

## Images

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

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> Source: [Besafe1st](https://besafe1st.com/products/arco-marine-premium-replacement-outboard-alternator-w-multi-groove-pulley-12v-50a-20850)
> Updated: 2026-06-02