RELIABILITY: Features heavy-duty internal contacts and a corrosion-resistant housing for extended service life in automotive and marine environments.

Key Features

• ✔ Direct fit for Bosch PMGR and DD starters
• ✔ 4-Terminal design (includes ignition bypass)
• ✔ High-grade copper winding
• ✔ Precision-engineered fitment

Technical Specs

Voltage:	12 Volts
Number of Terminals:	4 Terminals
Body Diameter:	50.3mm
Mounting Bolt Hole:	34mm (Center to Center)
Battery Terminal:	M8 x 1.25
Motor Terminal:	M8 x 1.25

Make/System	Model/Application	Notes
BMW / VW / Audi	Various 1970s-2000s models	Bosch 107, 108, 110, 208, 211 series
Land Rover	Discovery / Defender / Range Rover	Check against Bosch 0331303xxx
Alfa Romeo / Fiat	Classic Spider, GTV, 155	12V intermittent duty

Is this a genuine original part?

This is a premium quality aftermarket replacement part from 4Drive, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.

How do I know if it is compatible?

We recommend checking the SKU/MPN and Cross Reference list provided above. If your original Bosch part number starts with 0-331-303-xxx and has 4 terminals, this is the correct replacement.

What is the 4th terminal used for on this solenoid?

The 4th terminal (often marked as 'R' or '15a') is typically an ignition bypass terminal. It provides full battery voltage directly to the ignition coil during cranking to assist in cold starting, a feature common in many classic European vehicles.