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Resistor Resistance Check

Using an ohmmeter set to low scale, check resistance of each resistor in primary circuit. See RESISTOR SPECIFICATIONS table . Most models use 2 ballast resistors. Some manufacturers use resistor wires instead of ballast resistors.

RESISTOR SPECIFICATIONS

Application Resistance (Ohms)
Audi 1.0
BMW 0.4-0.6
Fiat X1/9 & Strada .85-.95
Mercedes-Benz .35-.45 and.55-.65
Peugeot 0.5
Porsche
  924 1.0 and 1.5
  928 .35-.45 and.55-.65
Saab
  Starting 0.6
  Running 1.0
Volvo 1.0
Fig 1: Bosch Electronic Ignition System Wiring Diagram (Typical)
G09350931Courtesy of NOT AVAILABLE