Master Cutoff Switch

[CMcAllister]

Rulebook states "push" must be the off action on a push-pull type mechanism. And most of the levers on switches I'm aware of go CCW to turn off if it's mounted that way. Also states it must be marked.

I'm a fan of having some type of secondary cable or other way of operating the master from the driver's seat, for both safety and convenience.

[Larry Hill]

I have one in the car next to me that kills everything, just in case!

[FireSale]

Originally Posted by Larry Hill

I have one in the car next to me that kills everything, just in case!

Ditto.

[Keith 944]

Originally Posted by FireSale

Ditto.

This Might be part of the problem, you get in an accident, shut your power off, first guy there thinks he’s turning it off and has turned it back on...
It should also be mandatory if you have one inside the car it moves the lever outside the car also, which I’m sure most people already do

[Larry Hill]

The disconnect inside the car will not be affected by the outside disconnect being in the on position. The outside disconnect feeds the inside disconnect.














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[FireSale]

Originally Posted by Keith 944

This Might be part of the problem, you get in an accident, shut your power off, first guy there thinks he’s turning it off and has turned it back on...
It should also be mandatory if you have one inside the car it moves the lever outside the car also, which I’m sure most people already do

When I had a push-pull system, I had a cable running from the trunk switch to a lever in the cockpit, Pushing the lever physically moved the rod on the back bumper. Since emergency persons are trained to move that switch, they could possibly turn the car back on. My current setup is a rotary switch on the back deck that cuts all power between the battery and the car. The power feed into the cabin is through a continuous duty Cole Hearse solenoid connected to an aircraft switch on the console to energize it. If something goes haywire I can slap that switch and kill all the accessories and ignition power. There is still one hot wire in the cabin (the battery cable) but the juice isn't going anywhere. It's a quick way of shutting off the ignition and fuel pump without flipping multiple switches.

[Jeff Stout]

If I have battery in stock location and add a second battery in back do I need a master cut off switch?
I think I don't but asking as I need to add a battery.

[FireSale]

Originally Posted by Jeff Stout

If I have battery in stock location and add a second battery in back do I need a master cut off switch?
I think I don't but asking as I need to add a battery.

General: 8.4 Mandatory when battery is relocated or as outlined in Class Requirements.


Check the current class rules for your car. My guess is yes. Battery in trunk = rear deck mount cut off.

[cmracing]

Originally Posted by Jeff Stout

If I have battery in stock location and add a second battery in back do I need a master cut off switch?
I think I don't but asking as I need to add a battery.

Yes! And if you want to wire this car "correctly" you will need a large constant-duty relay under the hood to disconnect the front battery from the rear switch........ Pain in the butt and extra cost, but well worth the hassle. I did an NHRA Stocker like this, the only "issue" is you need to remember to turn the main power off, especially after you put the car in the trailer. That constant-duty relay pulls a decent amount of power and will drain your batteries.........

Now, back to the battery location issue. I have a 2008 Buick Lucerne, stock battery location is under the rear seat. My 2015 Camaro has the battery in the trunk, from the factory, so do the newer Vettes.

These batteries are no relocated, wonder when the NHRA will start looking at these vehicles and making people put a switch in the rear of the car.

And what about those electric vehicles............

[Ed Carpenter]

Travis, I’m guilty of not having mine labeled. Thanks for the reminder, I will address it.