Wacker Neuson 5000160982 Sec 3800-4000W Alternator

The Wacker Neuson is a genuine OEM Sec 3800-4000W Alternator designed for GP3800A and GP4000 series portable generators. As a direct factory replacement, this alternator is built to the same specification as the original unit, ensuring correct output rating and compatibility across the GP3800 and GP4000 generator families. Whether you are running the standard GP3800A, an EPA-compliant variant, or the GP4000, part number is the verified replacement for this application. Replacing a failing alternator with the correct OEM component restores full rated power output and protects downstream electrical loads connected to the generator.

Key Features

• Matched Output Rating — Rated for 3800–4000W output, this alternator meets the exact electrical generation spec required by the GP3800A and GP4000 platforms.
• Genuine OEM Component — Sourced directly from Wacker Neuson, this part carries the same winding configuration, terminal layout, and insulation grade as the original alternator.
• Broad GP-Series Fitment — Confirmed fit across multiple GP3800A and GP4000 configurations, including standard, premium, wheel kit, EPA, and CSA variants.
• Direct Drop-In Replacement — Mounts to the existing generator frame using the original bolt pattern and connects to the factory wiring harness without modification to terminals or mounting hardware.
• Sustained Power Delivery — A correctly functioning alternator maintains stable voltage and frequency output; a worn or failed unit causes voltage drop, load shedding, and potential damage to connected equipment.

The alternator in a portable generator is the component responsible for converting mechanical energy from the engine into usable AC electrical power. It contains a rotor and stator winding assembly that together produce the voltage and current delivered to the generator's outlets. When the alternator degrades — through winding breakdown, bearing wear, or insulation failure — output becomes unstable or drops entirely, making the machine unable to power tools, lighting, or site equipment. Replacing the unit with the correct-rated alternator restores full generator capacity and protects the equipment connected to it.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.