Alternator Conversion Kit, 90 Amp for Type 1 VW

OVERVIEW

Upgrade your air-cooled Volkswagen''s electrical system with the ultimate power solution: the IAP 90 Amp Alternator Conversion Kit. If you have ever experienced the frustration of dimming headlights at a stoplight or a battery that just cannot keep up with your modern accessories, this kit is the definitive answer. Standard factory generators and even early 55-amp alternators often struggle to provide enough current for high-intensity discharge (HID) lighting, high-output audio systems, and modern electronic fuel injection setups. By stepping up to a massive 90-amp output, you are ensuring that your Type 1 engine has a surplus of reliable 12-volt power, providing consistent voltage across the entire RPM range and significantly improving the reliability of your classic VW.

This comprehensive conversion kit is designed to replace your outdated 12-volt generator or failing low-output alternator with a modern, internally regulated unit. One of the greatest advantages of this 90-amp alternator is the integrated internal regulator, which simplifies your engine bay wiring by eliminating the need for an external regulator box mounted under the rear seat or on the firewall. The kit includes the 90-amp alternator, a heavy-duty alternator stand, a secure mounting strap, and a sleek 3-piece black backing plate kit to ensure a professional, factory-clean look. Whether you are building a high-performance street Beetle, a rugged Baja Bug, or a weekend cruiser, this kit provides the electrical backbone necessary to handle the demands of 21st-century driving while maintaining that iconic air-cooled aesthetic.

FITMENT

This conversion kit is designed for Type 1 upright air-cooled engines and is compatible with the following models:

• VW Beetle (Standard & Super): 1967-1977 (Sedans) and 1967-1979 (Convertibles).
• VW Karmann Ghia: 1967-1974.
• VW Bus / Transporter (Type 2): 1967-1971 (Models equipped with Type 1 upright engines).
• VW Thing (Type 181): 1973-1974.
• Custom Applications: Ideal for Dune Buggies, Sand Rails, and Trikes utilizing a VW Type 1 1300cc, 1500cc, or 1600cc based engine.
• Note: Can be used on pre-1967 models if the vehicle has been previously converted to a 12-volt electrical system.

SPECS

Below are the technical specifications for the AC903919 90 Amp Alternator Conversion Kit:

• Charging Output: 90 Amps (High-output capacity).
• System Voltage: 12 Volts.
• Regulator Type: Internal (Built-in for simplified wiring).
• Alternator Body Material: High-grade cast aluminum for superior heat dissipation.
• Alternator Stand: Heavy-duty cast aluminum construction.
• Backing Plate Kit: 3-piece steel set with a durable black finish.
• Mounting Hardware: Includes high-tensile steel alternator strap.
• Weight: Approximately 16.16 lbs.
• Required Components (Not Included): Pulley, shims, belt, gaskets, and charging indicator light.

PRO TIPS

1. The Critical Role of the Indicator Light

One of the most common mistakes during an alternator conversion is neglecting the dashboard charging indicator light. In a Volkswagen charging circuit, the small bulb in your speedometer isn''t just a warning light; it actually provides the initial "exciter" voltage to the alternator to start the charging process. If this bulb is burnt out, or if you are using an LED replacement without a proper resistor, the alternator may fail to charge entirely. Always ensure you are using a functioning incandescent bulb (typically a 12V 2W wedge or screw-in type) to guarantee the alternator kicks in as soon as the engine fires up.

2. Check Your Fuel Pump Clearance

Because a 90-amp alternator has a larger body diameter than a standard generator, you may encounter clearance issues with your original fuel pump. Standard "tall" fuel pumps used on generator-equipped engines will often strike the body of the alternator. To resolve this, you should install an "alternator-style" fuel pump, which features a tilted or lower-profile design specifically engineered to clear the larger alternator housing. If you are sticking with a mechanical pump, double-check this clearance before final assembly to avoid damaging the pump or the alternator casing.

3. Perfecting Belt and Pulley Alignment

Longevity of your alternator bearings and fan belt depends entirely on perfect alignment. When installing the 3-piece backing plate and the alternator onto the stand, use a straight edge to verify that the crankshaft pulley and the alternator pulley are perfectly in line. You can fine-tune the fore-and-aft position of the alternator by adjusting the shims behind the pulley or by slightly shifting the backing plates. A misaligned belt will not only wear out prematurely but can also create excessive side-load on the alternator shaft, leading to premature bearing failure and noisy operation. Always re-tension the belt after the first 50 miles of driving as new belts tend to stretch slightly.