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  1. #1

    Default Alternator with a master kill switch

    I am installing an alternator this year and have a concern that my master kill switch that is mounted in the negitive battry calbe will not kill the motor?
    I know on a street car if you remove the negitiave cable the car will continue to run.

  2. #2
    Join Date
    Aug 2016
    Location
    Central PA
    Posts
    14

    Default

    you need a 4 post battery disconnect. 2 posts for the battery cable and 2 for the alternator wire.

  3. #3
    Join Date
    May 2009
    Posts
    1,336

    Default

    Been there done that. Didn't find out till I needed to kill the motor and it kept on running get a 4 Post Switch

  4. #4
    Join Date
    Jun 2007
    Posts
    3,123

    Default

    You do need a 4 post disconnect. You can save some on wiring by jumping the alternator wire across the switch instead of running an extra wire from the switch to the battery.
    Like this: https://karlperformance.com/images/F176618263.jpg

  5. #5

    Default

    Matt, Is the method you’re saying to use wired into the ground (negative) side of battery? I’m thinking when using an alternator, you’d have to run wire from alt. to one small terminal on disconnect and wire from battery positive to other small terminal on disconnect. Then 2 big lugs on disconnect could be in negative circuit to and from battery per lucas oil rules

  6. #6
    Join Date
    May 2007
    Location
    Fulton Missouri
    Posts
    623

    Default

    Depends on alternator. Some require a switch so they don't drain the battery or ruin the alternator. Some you just run direct to battery and not worry about it. With the new switch rules I'd just n
    Buy a new alternator.

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