ANSWERS: 3
  • Assuming that you are putting the ground connection on one side of the fuse, and the positive connection on the other side with it connected, the reading should be "0" because you don't have POTENTIAL (voltage difference) between the two sides. You would have 12V on BOTH sides of the fuse (assuming it's good of course) so 12V - 12V = 0. Without the fuse inserted, and doing the same above, you would have POTENTIAL, as one side is at "0" and the other at "12V" so you will see a 12V reading as 12V - 0 = 12V. The test above is really of no use unless you are testing for BLOWN FUSES. If the fuse is in the holder and you have POTENTIAL (12V) across the fuse, you can assume that the fuse is blown because the circuit (fuse) is open.
  • Just means your fuses are good. You're trying to measure the voltage drop across the fuse, which is negligible.
  • i think he said when the fuse is in there is no voltage on either side of the fuse

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