Thank you for helping me wrap my head around this. I had to rush home and look under the hood, I had forgotten how the switch is implemented. Sure enough, it is being held open when the brake pedal is at rest. And “returns” to the normally closed state when pedal is depressed. Of course that concept has been covered several times already in this thread. So when the switch is not on the vehicle, it will be in the NC position and should read 0 Ω, as Shaffer has determined, but when the lever is moved (and spring tension is felt) the reading should indicate open. Shaffer states it reads 300, that is why it’s a good idea to test the meter by itself. Does the meter display 300 for open, or is the switch actually 300Ω when it should be open. If the switch is 300Ω when the lights are off, that may be enough resistance that the lights appear to be off, but there will still be current, and the battery will drain over time.
