12 volt vacuum pump amp draw question

Discussion in 'Electrical and Ignition' started by 22dog22, Jun 8, 2018.

  1. 22dog22

    22dog22 Well-Known Member

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    i have this 12 volt vacuum pump hooked up, the directions state to use a 10 am fuse, if I hook up the pump to the brake booster it blows a 10 fuse, if I do not hook the vacuum hose to the booster it does not blow the 10 amp fuse, it seems when I put a load on the pump it blows the fuse could it be under fused ? [ need higher amp fuse] when I go on the internet I see other vacuum pumps that look like mine and they say to use a 20-30 amp fuse what are your thoughts ?? not sure how to measure the amp draw when the pump is under the load
     
  2. KitCarlson

    KitCarlson Well-Known Member

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  3. 67Dart273

    67Dart273 Well-Known Member

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    I'm with Kit/ Dave but if the instructions are clear and there is nothing else on the 10A fuse, I'd suspect the pump is bad
     
  4. KitCarlson

    KitCarlson Well-Known Member

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    Measure the voltage too, if the voltage is low, the current increases.