Back probing is used to test electrical circuits without disconnecting or damaging terminals.
You can do this by inserting a pin down the wire at the terminal to get a reading.
Using a multimeter set to ohms you must touch the ohm meter together to get the ohmmeter resistance, which was 2 ohms. I measured a wire by back-probing at each terminal. I got a reading of 2.5 ohms. I then minus the 2 ohms, to get the wires resistance of 0.5 ohms.
This shows that I had connectivity by back-probing as I didn't get an infinite reading.
Good this is the purpose behind this exercise, to be able to test circuits/connections with out damaging the wires
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