Distributor Pick-Up Coil Short & Resistance Checks

1. Disconnect pick-up coil leads from HEI-EST module "N" and "P" terminals (usually a Green and a White wire). To check for shorted pick-up coil, set ohmmeter in middle range.
2. Connect an ohmmeter lead to either pick-up coil wire terminal. Connect other lead to distributor housing. See Fig 1. Reading should be infinite. If not, replace pick-up coil.
3. Connect ohmmeter leads to both pick-up coil leads, while flexing wires and connectors to locate intermittent opens. See Fig 1. Resistance should read a constant unchanging value between 500 and 1500 ohms. If not, replace pick-up coil.

Fig 1: Distributor Pick-Up Coil Short & Resistance Checks. Notice ohmmeter test points.