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80 amp fuse sparks when attached to positive terminal. Runs down battery after a few hours

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  • Timllfixit Mar 30, 2015

    Start methodically. The alternator is permanently connected to the battery so is live at all times. Disconnect the heavy cable or plug to the alternator, retry the fuse cable and see if it still sparks. If not then there is a problem with the alt. If it does then try another circuit by removing all the fuses and refitting one at a time. There could be some small spark on certain circuits but if one or more diodes in the alt have gone down there will be a reverse flow of power. Try also disconnecting the starter cable but not the smaller cables as this is also permanently connected to the batt. Next is to look for a harness trapped or rubbed somewhere through age or vibration which carries a large power supply wire to other things. If you have access to an ammeter of 100 amps or someone with car electrical experience, you could connect the ammeter to the wiring side cable and when the other ammeter terminal was touched to the battery positive you would see an approximate current and from that you may deduce the level of fault. The ignition may be off but the power supply to it comes direct from the battery or starter heavy terminal to the switch and is also live. Work methodically and you should have no trouble isolating the problem.

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  • Cars & Trucks Master
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On what? Give us a clue,

Posted on Mar 30, 2015

  • Ronald Friesz
    Ronald Friesz Mar 30, 2015

    My 80 amp fuse is in a 1988 toyota pickup
    When I touch fuse wire to + post it sparks even if key not in ignition.

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