Hot Rods 1953 ford battery disconnect help

I have a 53 Ford f 100 all stock and would like to put a battery disconnect on it. How does it get hooked up with positive ground ?

 

https://www.jalopyjournal.com/forum/threads/battery-disconnect-positive-or-negative.211450/

I like to use the grounded side, positive in your case. I’m not a racer, don’t know the current rules there.

 

Ground side here also

 

They usually only fit on the smaller post.

 

Whether it's positive or negative ground makes no difference. Generally, the switch is installed on the non-grounded side but it really doesn't matter.

 

This has been discussed other times on this and/or other forums. I believe some sanctioning bodies specify the disconnect on the ground and others say on the hot side but I'm not 100%positive. I personally like the ground side for the disconnect. Think about when you disconnect the battery, you take off the ground side first. If you take off the hot side first you run the chance of the wrench grounding itself while you're disconnecting the hot terminal. Arc welding with a wrench is never good in my book. If a battery disconnect is on the hot side and something comes in contact with the hot terminal and ground at the same time, sparky sparky. If the same thing happens with the disconnect on the ground side, nothing. JMHO.

 

It doesn't matter - electrons, apart from being very helpful, are essentially very dumb, so they don't care which way you do it.

 

NHRA says positive (hot) for disconnect. Don't know about other sanctioning bodies.

 

It doesn't matter all that much and it may be where you can place it where it is either easy to reach or where it is hidden enough to foil a thief. I'd say ground side if you are wanting to use it as anti theft. A thief might figure out that you have it in the positive cable when they go to hot wire the truck but No ground is going to give the idea that it has a dead battery.

 

That's because the Ignition and Charging system are already grounded. When the Battery is diconnected the charging system will still supply power to the ignition.
Most Sanctioning bodies require the battery disconnect to "shut -off" the engine

You already have a battery disconnect [well sort of] in your vehicle.
It's called a firewall mounted Ford Starter solenoid.

The power feed to the rest of the vehicle can is taken off the battery side of this Starter Solenoid .
put a switch between this post and the main power feed that is at least 40a capable.
.
Do you want to add the safety feature that most motorsport sanctioning bodies require?
Then make sure the wire from the charging system is on the battery side of the switch,or direct to the battery [so it cannot feed the ignition when this switch disconnects the main circuit]
To prevent the charge wire from being live when the battery is disconnected, simply add a diode into the charge wire as close to the battery as possible.

A 40a switch is capable of supplying 480 watts at 12 volts