Ignition Coil Resistance Check
- The ignition coil is designed to work with an external ballast resistor. When testing coil for output, include resistor tests. Inspect coil for external cracks and arcing. To check primary resistance, attach ohmmeter leads to both primary terminals with coil wire removed to isolate it from the system.
- To check secondary resistance connect ohmmeter leads to coil negative terminal and to terminal in coil tower.
Ignition Coil Resistance Specifications
| Application | Ohms | ||
|---|---|---|---|
| Ignition Coil | |||
| Primary Resistance | |||
| Prestolite | 1.60-1.70 | ||
| Essex | 1.34-1.55 | ||
| Secondary Resistance | |||
| Prestolite | 9, 400-11, 700 | ||
| Essex | 9, 000-12, 200 | ||
| Ballast Resistor | |||
| Single Resistor | 1.1-1.3 | ||