Originally Posted by
tunaglove
I agree that putting a load on the circuit would be a better test. However, the pcm does not supply the ground to the heater until the engine is running. He's already stated he is in the driveway in the mud, so let's save that test for last.
I've seen several people get off track by not loading a circuit when taking measurements, I'd rather do it right the first time, and make sure. And yes, I'd like to keep him out of the mud too, but it appears he has a deadline to meet!
He could use one of his old worn out sensors that has a good heater in it for the load, just cut off the heater minus wire at the connector and ground it to a good ground, turn on the key and measure the voltage at the connector. Just remember that the sensor might start to heat up. If he is still close to that 10.45 volts then we know it isn't that side of the circuit.