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Thread: Master cutoff switch

  1. #1
    Senior Member
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    Master cutoff switch

    Anyone installed, or thinking of installing a master battery switch?

    If so, where are you thinking? I'm doing bench seats, and not sure of rear bulkhead area will be accessible .

    Comments, Ralph.

  2. #2
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    I have one sitting in its package on the floor. I'm just thinking that once I have the seat, I'll make it work somewhere. If the seat is 2 pieces, I could make the back folding or removable maybe. But yes, I'll be doing one.

  3. #3
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    I’m going to use a light aircraft style master contactor (looks like a Ford starter solenoid but has a lower amp continuous duty coil) and mount it right by the battery. Then it will just require a toggle switch running low current, possibly hidden, to actuate it. Should be tidy.

  4. #4
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    Pat, I wish I knew what you just said.
    Thanks, Ralph

  5. #5
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    Hi Ralph:
    Like this, but there are less expensive sources.
    https://www.aircraftsupply.com/X61-0028.html
    Best Regards

  6. #6
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    This is the one I’ve ordered, the 12 volt version.
    https://m.aircraftspruce.com/catalog...asterrelay.php
    Pat

  7. #7
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    On my 55 Chevy I used a master disconnect that is controlled by a key fob. It worked great since I had the battery in the trunk behind a panel that is hard to get to. Prob will go the same way on this build. I will try to find the info on it this weekend.

  8. #8
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  9. #9
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    Jeep, does product you used just turn off connection to battery when drainage is detected, or can it be used as an anytime total disconnect switch? I am thinking of just disconnect switch, and not worried about trickle drain.
    And, where is a good spot to mount in pickup.?

    Thanks, Ralph

  10. #10
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    It mounts on battery post. I will get a photo of mine on the 55 this weekend. It comes with 2 key fob's that you can push a button on the remote and cut it off.

  11. #11
    Senior Member AC Bill's Avatar
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    I wired a battery master switch, using the negative side. It's there for safety while working on the vehicle, an accident, but also as an anti-theft deterrent.

    I also added a "keep-alive: wire, with a low amp fuse, to prevent the computer from losing memory. The fuse would pop from any higher amperage draw, if there was a major short, or someone tried to start the vehicle.

    You probably want the switch mounted in a spot that you could still reach it easily, in an emergency.

  12. #12
    Senior Member KenWilkinson's Avatar
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    l'm looking at something like this -> https://www.amazon.com/dp/B00445KFZ2...v_ov_lig_dp_it

    Mechanical, one moving part. No electronics.

  13. #13
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    Here is how the one I used in the 55 hooked to the battery. The kit comes with a lot of terminal options.

    IMG_1923.JPG

  14. #14
    Senior Member KenWilkinson's Avatar
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    Quote Originally Posted by nbjeeptj View Post
    Here is how the one I used in the 55 hooked to the battery. The kit comes with a lot of terminal options.

    IMG_1923.JPG
    Can't work on the 35. The battery is not that accessible. Under the bed, behind the cab. Unless you are thinking somewhere else.

  15. #15
    Senior Member AC Bill's Avatar
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    This style switch is very popular. You can remove the key for extra security if needed. You could mount it under the dash, behind the seat, engine compartment, etc.

    https://encrypted-tbn0.gstatic.com/i...cJbEz1DS7zFPtg

    If quick access isn't a chief concern, this battery mounted one would be the simple one to install.

    https://www.amazon.ca/WirthCo-20148-...67347148&psc=1
    Last edited by AC Bill; 12-09-2018 at 05:41 PM.

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