# ARCO Marine Premium Replacement Alternator w/Single Groove Pulley - 12V 70A [20102]

**Premium Replacement Alternator with Single Groove Pulley - 12V 70A**

Replacement alternator that will fit Mercruiser, BRP-OMC, 12 Volt, 70 Amp, Self-exciting, Ignition protection screens, Internal regulator, Negative ground, 1-wire connection, 2-inch mounting foot, Single groove pulley included.

**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:**

MERCURY 32701  
MERCURY 47456A1  
MERCURY 56045  
MERCURY 59755  
MERCURY 69729  
Sierra 18-5950

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

**Specifications:**

-   Amperage: 70A
-   Voltage: 12v
-   Box Dimensions: 8"H x 8"W x 9"L WT: 12 lbs
-   UPC: 693006001128

  
[Quick Guide (pdf)](https://productimageserver.com/literature/quickGuide/97204QG.pdf)

## Details

- **Price:** 254.72 USD
- **Type:** Alternators
- **Tags:** Brand_ARCO Marine, Clearance, Engine Parts & Service, Engine Parts & Service | Alternators, Specials

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 254.72 USD | In stock |

## Images

- ARCO Marine Premium Replacement Alternator w/Single Groove Pulley - 12V 70A [20102] ARCO Marine
- ARCO Marine Premium Replacement Alternator w/Single Groove Pulley - 12V 70A [20102] ARCO Marine
- ARCO Marine Premium Replacement Alternator w/Single Groove Pulley - 12V 70A [20102] ARCO Marine
- ARCO Marine Premium Replacement Alternator w/Single Groove Pulley - 12V 70A [20102] ARCO Marine

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> Source: [Besafe1st](https://besafe1st.com/products/arco-marine-premium-replacement-alternator-w-single-groove-pulley-12v-70a-20102)
> Updated: 2026-05-21