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Thread: Fuse for power outlet in luggage compartment

  1. 2nd November 2019, 10:12 PM #11
    DiscoJeffster
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    And when you short the positive to the earth in the plug, at least you’ll be sure you have a fuse to replace if you didn’t before Fuse for power outlet in luggage compartment
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  2. 3rd November 2019, 04:18 PM #12
    rocket rod
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    Quote Originally Posted by drivesafe View Post
    Hi Barraman, this might save you some time.

    Leave all the fuses in place. Use your multi meter probes, place the negative probe on a good earth then just touch the two small silver tabs on the top of each fuse with the positive probe.

    If the fuse is not powered, you will get no readings off either tab.

    If the fuse powered and is good, you will get a voltage reading on both tabs.

    If the fuse is blown, only one tab will give a positive reading.
    Tim, if the fuse is not powered but broken, you'll still get no reading, so by my thinking that test will only work on powered fuses?
    Rod

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  3. 3rd November 2019, 07:47 PM #13
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    DieselLSE
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    Quote Originally Posted by rocket rod View Post
    Tim, if the fuse is not powered but broken, you'll still get no reading, so by my thinking that test will only work on powered fuses?
    Not quite. The power supply side will still give a 12v reading as the broken metal tab will still be receiving 12v. It's just not being transmitted to the other side of the fuse which will give no reading.
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  4. 3rd November 2019, 10:32 PM #14
    DiscoJeffster
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    Quote Originally Posted by DieselLSE View Post
    Not quite. The power supply side will still give a 12v reading as the broken metal tab will still be receiving 12v. It's just not being transmitted to the other side of the fuse which will give no reading.
    No. Reread exactly what he posted. If the circuit isn’t active (car not started for example) then you won’t get 12V on either side so then you haven’t tested the validity of the fuse in that scenario. IMO for those I’d do a continuity test which would beep if the fuse is ok to rule that fuse out.
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