Resistor Resistance Check
Set an ohmmeter in the low scale. Be sure ignition switch is "OFF". Check resistance of each resistor in the primary circuit. See Figure. Some manufacturers use resistor wires instead of ballast resistors. Most use 2 ballast resistors.
Resistor Resistance Specifications (Ohms)
| Application | Ohms |
|---|---|
| BMW | 0.4 and 0.6 |
| Fiat Strada & X1/9 | .85-.95 |
| Mercedes-Benz | .35-.45 and.55-.65 |
| Peugeot 604 | 0.5 and 0.5 |
| Porsche | 0.4 and 0.6 |
| Saab | 0.4 and 0.6 |
| Volvo | 1.0 |