Battery disconnect switch circuit?
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Elder User
Joined: Aug 2011
Posts: 649
Likes: 1
From: Tucson, AZ
Hey guys, I have the battery disconnect switch pictured below as well as the circuit branch shown in the diagram. My intention is to use it as a poor man's anti theft device to give thieves one more obstacle to overcome. I'll "hide it" under the seat or something like that. But I am unsure about which circuit to put the switch in. I am thinking it should go on red wire 2A between the circuit branch and the starter solenoid BAT stud. Is that right or should it go in a different circuit? Thanks! Tyler
Lead Driver
Joined: Jul 2003
Posts: 9,365
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From: AKRON ohio
I don't know if its right or wrong but, I have the same switch on my truck and I have it between the negative cable and the frame (neg cable runs to the switch and then to ground )
I have used it this way since 1999
I have used it this way since 1999
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Elder User
Joined: Aug 2011
Posts: 649
Likes: 1
From: Tucson, AZ
Ok thanks. So with that set up, I assume the switch is under your hood? T
Logistics Pro
Joined: May 2010
Posts: 3,793
Likes: 19
From: Austin
Hey Tyler,
We went with a hidden fuel pump manual switch. So far the only person
it's worked on is me. My son Zack will switch it off & I'll go out to drive the truck & it won't start no matter what I do....
Ben in Austin
1950 F1
We went with a hidden fuel pump manual switch. So far the only person
it's worked on is me. My son Zack will switch it off & I'll go out to drive the truck & it won't start no matter what I do....
Ben in Austin
1950 F1
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Elder User
Joined: Aug 2011
Posts: 649
Likes: 1
From: Tucson, AZ
Phantom of the Phorum
Joined: Jan 2011
Posts: 5,472
Likes: 1,696
From: Kentucky
We have one similar on our deuce and a half. It is between the main negative and the negative post on the battery.
Is this just a switch to turn or is the red thing a removable key? Ours was just a switch but we replaced it with a switch with removable key.
Is this just a switch to turn or is the red thing a removable key? Ours was just a switch but we replaced it with a switch with removable key.
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Elder User
Joined: Aug 2011
Posts: 649
Likes: 1
From: Tucson, AZ
Yeah the red thing is a removable key...
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Elder User
Joined: Aug 2011
Posts: 649
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From: Tucson, AZ
My other thought was to put it in the 12V supply wire going to the hei distributor. Would that keep the car from turning over? It would wouldn't it? And more difficult for a thief to circumvent? T
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Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
Those heavy duty switches are designed to be a safety switch, master disconnect switch. If you have an electrical short, cut this switch off and save the truck. Most any toggle switch installed in the coil circuit and hidden anywhere would work as an inline ignition cut off.
Cargo Master
Joined: Oct 2013
Posts: 2,580
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From: in a barn
You can put a simple toggle switch inline with the HEI 12v line, I used one before on a car as an anti theft device and had it mouned under the dash. That large disconnect you have as stated is to be a master disconnect on a battery cable.
Lead Driver
Joined: Jul 2003
Posts: 9,365
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From: AKRON ohio
I like the style you bought because if done the way I do it on the ground side EVERYTHING is off and no risk of fire. Just like you took a cable off the battery
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
Be real careful the switch is rated high enough for cold weather cranking duty, or you'll just create a new problem. Most of these are Hecho en Chine now and copper is expensive... so most are rated under 300 amps. That may be fine for a modern 4-banger with gear-reduction starter, not so much for an old V8 with field coil starter on a cold day. The marine switches are generally higher quality, I believe these are required equipment on most I/O boats, and have some kind of UL/CE rating.
Tyler, you could mount that switch on the inner fender, so you can switch it by reaching thru the wheel opening. Or up under the dash, as close to the battery as possible, with the handle on the inside.
Tyler, you could mount that switch on the inner fender, so you can switch it by reaching thru the wheel opening. Or up under the dash, as close to the battery as possible, with the handle on the inside.
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