{"product_id":"beru-blue-12v-ignition-coil-3-5-ohm-oil-filled-00-9403-b","title":"Beru Blue 12V Ignition Coil — 3.5 Ohm, Oil-Filled | Air-Cooled VW \u0026 Vintage European (00-9403-B)","description":"\u003cp\u003eBeru Blue 12-volt oil-filled ignition coil, 3.5 ohm primary resistance — a classic-fitment ignition coil for restored 12V air-cooled VWs and other vintage European vehicles converted to 12-volt electrical systems. EMPI part #00-9403-B. The Beru Blue is a long-standing factory-look upgrade for owners who want a German-brand, period-appearance coil rather than a generic aftermarket unit.\u003c\/p\u003e\n\n\u003ch3\u003eWhy a 3.5 ohm oil-filled coil\u003c\/h3\u003e\n\u003cp\u003eThe 3.5 ohm primary resistance is the correct match for stock VW points ignition (Bosch distributor with internal points and condenser) on a 12-volt system. Running a coil with too low a resistance will burn through points quickly; too high and the spark will be weak at higher RPM. The 3.5 ohm spec is the factory match for the original Bosch 12V coils that this part replaces.\u003c\/p\u003e\n\n\u003cp\u003eOil-filled coils dissipate heat better than epoxy-filled coils, which matters in hot engine bays — particularly on air-cooled VWs where the coil mounts directly to the fan shroud and runs warm constantly. The trade-off is that oil-filled coils must be installed upright; mounting them upside-down or on their side will eventually cause oil to migrate and the coil to fail.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12 volts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary resistance:\u003c\/strong\u003e 3.5 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Oil filled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Beru Blue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Beru (German manufacturer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 00-9403-B\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e12-volt VW Beetle, Karmann Ghia, Type 3, Bus, and Thing with stock points ignition\u003c\/li\u003e\n\u003cli\u003eAir-cooled VWs converted from 6V to 12V electrical\u003c\/li\u003e\n\u003cli\u003eVintage Porsche, BMW, and Mercedes 12V applications using a 3.5 ohm coil\u003c\/li\u003e\n\u003cli\u003eAny 12V points-ignition vehicle where a 3.5 ohm coil is the factory spec\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWill NOT work for:\u003c\/strong\u003e 6-volt electrical systems (use a 6V coil instead), modern electronic ignition systems that specify a low-resistance coil (typically 0.6–1.5 ohms — installing a 3.5 ohm coil with electronic ignition will produce weak spark).\u003c\/p\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill this work with Pertronix or other electronic ignition?\u003c\/strong\u003e\u003cbr\u003e\nCheck your electronic ignition module's specs. Most Pertronix Ignitor units (the basic version) work with a stock 1.5–3.5 ohm coil. Pertronix Ignitor II and III, and most Crane \/ MSD systems, require a lower-resistance coil. When in doubt, use the coil specified by your ignition module manufacturer.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I mount it sideways or upside down?\u003c\/strong\u003e\u003cbr\u003e\nNo. Oil-filled coils must be mounted upright (terminal end up) so the oil stays in contact with the internal windings. Mounting at an angle is acceptable; upside-down is not.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the Beru Blue better than the Bosch Blue?\u003c\/strong\u003e\u003cbr\u003e\nFunctionally they're equivalent — both are German-made, 3.5 ohm, oil-filled, 12V coils. Beru is the OE supplier on many vintage German cars; Bosch is the OE supplier on others. Either is correct for a restored 12V air-cooled VW.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes it come with the mounting bracket?\u003c\/strong\u003e\u003cbr\u003e\nThis listing is the coil only — confirm bracket needs separately. If you're replacing a similar Bosch or Beru coil, your existing bracket will fit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat's the difference between Beru Blue and Beru Silver\/Red?\u003c\/strong\u003e\u003cbr\u003e\nColor generally indicates voltage and resistance spec. Beru Blue is the 12V 3.5 ohm coil. Other colors in the Beru line have different electrical characteristics — match the color to your application.\u003c\/p\u003e","brand":"Washburn's Metal","offers":[{"title":"Default Title","offer_id":44699427307635,"sku":null,"price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/2760\/1523\/files\/00-9403-B-scaled-500x385.jpg?v=1775363147","url":"https:\/\/shop.washburnsmetal.com\/products\/beru-blue-12v-ignition-coil-3-5-ohm-oil-filled-00-9403-b","provider":"Washburn's Metal","version":"1.0","type":"link"}