Here's a quick video showing testing resistance from the fuel injector using a test connector into the valve cover gasket on a 7.3 liter Ford Powerstroke. Measure from the injector power to single ground on the test connector. I'm using the wiring adapter that connects to the valve cover connector.This test connector can be made out of the connector repair kit.
![](https://i.ytimg.com/vi/OhvncuEQUag/maxresdefault.jpg)