Beru Blue 12V Ignition Coil | Air-Cooled VW & Vintage European | 3.5 Ohm Oil-Filled (00-9403-B)

Beru Blue 12-Volt Ignition Coil | 3.5 Ohm, Oil-Filled

Beru Blue 12-volt oil-filled ignition coil, 3.5 ohm primary resistance — the classic-fitment coil for restored 12V air-cooled VWs and other vintage European vehicles on 12-volt electrical systems. EMPI part #00-9403-B. A long-standing factory-look upgrade for owners who want a German-brand, period-appearance coil over a generic aftermarket unit.

The 3.5 ohm resistance is the correct match for stock VW points ignition (Bosch distributor with internal points and condenser) on a 12-volt system. Oil-filled construction dissipates heat better than epoxy-filled coils — important in hot air-cooled engine bays where the coil mounts to the fan shroud — but requires upright mounting.

Vehicle Fitment

• 12-Volt Air-Cooled VW: Beetle, Karmann Ghia, Type 3, Bus, and Thing with stock points ignition
• Converted VWs: Air-cooled VWs converted from 6V to 12V electrical
• Vintage European: Porsche, BMW, and Mercedes 12V applications using a 3.5 ohm coil
• Will NOT work for: 6-volt systems (use a 6V coil), or electronic ignition specifying a low-resistance coil (typically 0.6–1.5 ohms).

Why Choose Beru?

Beru is an OE supplier on many vintage German cars, so the Beru Blue delivers a correct 3.5 ohm 12V spec with factory appearance for a restored air-cooled VW.

Key Features & Benefits

• Correct 12V Spec: 3.5 ohm primary resistance matched to stock points ignition.
• Oil-Filled Cooling: Dissipates heat better than epoxy-filled coils in hot engine bays.
• Period Appearance: German-brand Beru Blue body for a factory-look install.
• Direct Replacement: Replaces original Bosch/Beru 12V coils.

Technical Specifications

• Voltage: 12 volts
• Primary Resistance: 3.5 ohms
• Construction: Oil filled (mount upright)
• Color: Beru Blue
• Brand: Beru (German manufacturer)
• Part Number: 00-9403-B

Frequently Asked Questions

• Will this work with Pertronix or other electronic ignition? Check your module's specs. Most Pertronix Ignitor (basic) units work with a stock 1.5–3.5 ohm coil; Ignitor II/III and most Crane/MSD systems require a lower-resistance coil. When in doubt, use the coil specified by your ignition manufacturer.
• Can I mount it sideways or upside down? No. Oil-filled coils must be mounted upright (terminal end up) so the oil stays in contact with the internal windings. An angle is acceptable; upside-down is not.
• Is the Beru Blue better than the Bosch Blue? Functionally they're equivalent — both German-made, 3.5 ohm, oil-filled, 12V coils. Either is correct for a restored 12V air-cooled VW.
• Does it come with the mounting bracket? This listing is the coil only. If you're replacing a similar Bosch or Beru coil, your existing bracket will fit.
• What's the difference between Beru Blue and Beru Silver/Red? Color generally indicates voltage and resistance spec. Beru Blue is the 12V 3.5 ohm coil; other colors have different electrical characteristics — match the color to your application.

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