Q: Testing pickup coil with ohmn meter

If you can operate the engine to bring it to normal operating temperature, the ohm readings will be more accurate (the following readings are for a hot engine). For the pick up coil (magnetic pick up assembly), connect your ohmmeter between the orange and purple wires. Resistance should be 400-800 ohms. Next, connect the ohmmeter between the black wire and a good ground on the engine. Operate the vacuum advance either by hand or with an external vacuum source. Resistance should be basically 0 ohms. Finally, connect the ohmmeter between the orange wire and ground, and then between the purple wire and ground. Resistance should be over 70,000 ohms in both cases. If any of your ohmmeter readings differ from the above specifications, then the component is defective and must be replaced as a unit. If there is an operational problem with the engine and you want the required diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a basic engine diagnostic and the responding certified mechanic will get your issue resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.