You’ve all seen those electrical trouble-trees in service manuals. They’re the ones that take you step by step through a planned test sequence. They tell you to check the resistnce between two points with an ohmmeter. Then the trouble-tree says that if you get a test reading of 40 ohms you should do such-and-such. Or if you get 10 ohms, to do something else.
But what happens when you get 15 ohms with your old ohmmeter?