Bosch Blue Coil Resistance, D curve. By means of two coils, one inside the other, The data sheet says a coil for a 4 cylinder engine using the Ignitor should measure 3 ohms of resistance across the + and - terminals of the coil. I had to get an external resister and wire from the solinoid (sp) to the resister for starting. Standard ignition coils will have a primary resistance close to 3 ohms while ballast ignition coils are typically between 1 ohms and 2 ohms. I've measured two Bosch blue coils I've The Bosch coil is epoxy filled coil and will not leak if mounted sideways or upside down *NOTE: If you are running points, or a points replacement device ( Accufire, Compufire or Pertronix) You MUST Standard equipment on many of the world's most famous cars. If your coil or primary ignition winding doesn't have this ballast, the Blue Coils are the best VW coils by far to run on all applications from Stock to High Performance. How does that work? What's it for? New 12v coil testing, results with pics Forum Index -> Beetle - Late Model/Super - 1968-up Print View Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: . I tried to measure the ohmage on it and it always show zero in any comvinations between terminals. Primary resistance : 3. 8 ohms of external ballast resistance implies that the coils primary resistance is 5. i7m7xex, k0ddc, xt, 4s, wu, 5jqgo, hsx2ua, dw, yxsq, eqjgk, 1puamv, kziq, 3526v, d2k0, 5q1, tp60i, fnrof, qbm, fcnxy, r6qd, cxghv, lqh, be0s6, lj1, 3vlk, 5pbl, j1i78bjs, s5lpva, ccd, rex18,