Battery and Alternator Cutoff Switch

Electrical & Ignition

  1. Flash

    Flash Active Member

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    Hey have a 72 Charger with 318. Looking to install a cutoff switch for a few reasons (parasitic drain, theft, fire/safety). I want to install one in the cab of vehicle where I could reach it easily. Not looking for one that can used from outside of the vehicle.

    Has anyone installed one and what did you use?
     
  2. HEMI-ITIS

    HEMI-ITIS STREETER on LI FBBO Gold Member

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    I use the Moroso switch.
     
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    • 33 IMP

      33 IMP Well-Known Member

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      Me too. Ive got two, one nhra required on the rear valence, another about 90% concealed behind and under the passenger seat. If they arent both on, it aint goin nowhere! (Very small car, easily reachable from driver seat).
       
      Last edited: Oct 25, 2020
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      • 493 Mike

        493 Mike FBBO Gold Member FBBO Gold Member

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        You could use a switched solenoid to kill the battery. At that level only one small positive circuit interrupted by the manual switch of your choice.
        Mike
         
      • Nacho-RT74

        Nacho-RT74 FBBO Gold Member FBBO Gold Member

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        You don't actually need to cut the alternator hot wire but simply the ign system along with the batt of course. That will cut the alternator feed too. I think that's easier to wire than cut both, batt and alt hot wire.

        These use two big studs for batt wiring and two small terminals for ign wiring.
         
      • Flash

        Flash Active Member

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        So the Moroso 74101 instructions show connecting the battery and alternator to the same side of the switch. So I'm guessing that would work in cutting off power to both?

        493 Mike - what would you suggest, just searching the internet I noticed Painless has a remote solenoid disconnect. Would something like Painless 30204 work to cutoff both battery and alternator?

        Nacho-RT74 - what setup could I use for what you suggest? So I would wire the battery hot to disconnect, what would I need to wire from the ignition circuit to disconnect?

        So if these are dumb questions! I'm just starting to learn automotive wiring etc.
         
      • Nacho-RT74

        Nacho-RT74 FBBO Gold Member FBBO Gold Member

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        They cut the battery power, but as soon you also cut de ignition circuit ( blue wire coming out from ign switch ) you don't need to cut the alternator hot wire anymore because alternator will stop sourcing (alt field is sourced by the ign network). There are several brands. Dunno which on is the best but normally the ones I meant look like this:

        ion-battery-and-alternator-kill-switch-combination-battery-and-alternator-kill-switch-add-image1.jpg


        or this:

        FIA_approved-battery_isolator_switch-with-removable_key_for%20cars_1.jpg

        and they are wired like this:

        020_011.jpg
         
        Last edited: Oct 26, 2020
      • F4R/T

        F4R/T Well-Known Member

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        If your going for anti theft didn’t someone make a hydraulic keyed valve for your brake system? Between a no start and locked brakes the only other anti theft I can think of is a removable steering wheel and an owner with a 1187 and plenty of rounds for it.! Otherwise a stolen wrecker will get it as I’ve seen that happen in Caseyville Il.
         
      • 493 Mike

        493 Mike FBBO Gold Member FBBO Gold Member

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        I worked with a fella 40 odd years ago that had a brother in the used auto parts business. He had a penchant for "finding" empty/abandoned vehicles along the highways and just snagged them with his wrecker and headed to the yard. I don't remember hearing about him ever getting caught.
        Mike
         
      • 493 Mike

        493 Mike FBBO Gold Member FBBO Gold Member

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      • Flash

        Flash Active Member

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        F4R/T - theft could be part of it, but mainly looking to prevent any parasitic drain and to cut everything off in case of a fire.
         
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