Keep your Crusader running with this 70 Amp 12V replacement alternator. Designed as a direct-fit replacement for the engine - marine, marine stern drive listed below, it delivers reliable charging for standard and accessory electrical loads.
This unit features an internal fan (IF) and an internal regulator (IR), and is supplied with a S6 pulley already fitted.
DIRECT FIT: Replaces Arco Marine 20821 — no modification required on the machines listed below.
Key Features
✔High Capacity: 70 Amps of charging output.
✔Direct Replacement: Replaces Arco Marine 20821.
✔Pulley Fitted: S6 pulley installed and ready to fit.
✔Robust Design: IF fan. IR regulator.
✔Quality Assured: New aftermarket unit, 12 month warranty.
Technical Specs
Voltage:
12 Volts
Amperage:
70 Amps
Rotation:
CW (Clockwise)
Pulley:
S6
Regulator:
Internal (IR)
Fan Type:
Internal (IF)
Clock:
12
SKU Reference:
400-12331
Vehicle Fitment Guide
Make
Equipment Type
Models
Years
Crusader
Engine - Marine
5, 5.7, 6, 8.1
2001–2008
Pleasurecraft
Marine Stern Drive
305CI 5.0L, 350CI 5.7L, 364CI 6.0L, 496CI 8.1L
2001–2007
OEM Part Number Cross Reference
Arco Marine
20821
Arrowhead
ADR0315
Delco
19020617
EMP Parts
4-5984, 4-6453
J&N Electrical Products
400-12331, 400-12169
Lester
8467
Pleasurecraft
RA097007A
Quicksilver
8M6007463
Sierra Marine
18-5984
Frequently Asked Questions
Will this fit my Crusader 5?
Yes — the 5 appears in the fitment guide above. Check your existing part number against the cross reference table to confirm.
Is this a 70 Amp alternator?
Yes, this is a 70 Amp 12V unit with an IR regulator.
Is the pulley included?
Yes, a S6 pulley is pre-installed.
Is this new or remanufactured?
This is a brand new aftermarket unit — not a remanufactured core.
Note: Please verify your machine's serial number or existing part number to ensure compatibility. Fast dispatch from the UK.
