The external resistor block is located inside the engine compartment on the driver's side strut pod. The external resistor modifies the current going into the positive primary terminal of the ignition coil. This allows the coil to be constructed so that a strong spark is generated at high engine speeds.
NOTE: All of the electrical terminals for the trailing ignition coil have light colored protective caps, while all leading coil terminals have dark colored caps.
Connect the leads of an ohmmeter to the trailing coil side of the resistor (the side with the light colored caps). Resistance should be 1.26–1.54 ohms. Repeat the test on the leading side of the resistor (the side with dark caps). The reading should be the same as for the trailing side. If the reading is not within or close to this range, replace the resistor.
| Fig. 1: Checking the external resistor (left) and the
leading ignition coil's primary resistance (right) — 1979
RX-7
|
