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-   -   Master Cutoff Switch (https://classracer.com/classforum/showthread.php?t=72567)

Myron Piatek 03-26-2019 07:12 AM
Re: Master Cutoff Switch
 
Coincidently, NHRARacer.com has a battery question this week. I never had or plan to have a car faster than 9.99 or 135 mph. but I never knew or even noticed that they apparently need a cut-off regardless of battery placement. External switch also?

http://www.nhraracer.com/content/gen...336&zoneid=132

Ernie Neal 03-26-2019 07:28 AM
Re: Master Cutoff Switch
 
1 Attachment(s)
Quote:
Originally Posted by J&S Racing (Post 585805)
I’ve decided to run a switch even though I don’t plan on putting a battery in the truck just yet.

My question is about the wire from the alternator, can it run to the battery or does it need to be run to the switch?
probably need a cutoff like this one

Jon Sarrett 03-26-2019 08:02 AM
Re: Master Cutoff Switch
 
Quote:
Originally Posted by J&S Racing (Post 585805)
I’ve decided to run a switch even though I don’t plan on putting a battery in the truck just yet.

My question is about the wire from the alternator, can it run to the battery or does it need to be run to the switch?
Your alternator wire and battery cable should be on the same post on the switch. The other post on the switch will run the cable to your starter solenoid.

Ed Carpenter 03-26-2019 08:40 AM
Re: Master Cutoff Switch
 
Travis, I’m guilty of not having mine labeled. Thanks for the reminder, I will address it.

FireSale 03-26-2019 12:06 PM
Re: Master Cutoff Switch
 
Quote:
Originally Posted by Jon Sarrett (Post 585809)
Your alternator wire and battery cable should be on the same post on the switch. The other post on the switch will run the cable to your starter solenoid.
I had a double pole Moroso to kill the alternator until a short at the starter burned it out. I replaced it with a single pole rotary at half the price wired like this and it works fine. No engine run-on.

CMcAllister 03-26-2019 02:25 PM
Re: Master Cutoff Switch
 
Quote:
Originally Posted by FireSale (Post 585827)
I had a double pole Moroso to kill the alternator until a short at the starter burned it out. I replaced it with a single pole rotary at half the price wired like this and it works fine. No engine run-on.
This is the simple legal way to do it without extra wiring, solenoids, etc. You just have to be mindful that the alternator lead is always hot, and pay attention to making sure it is protected where it is routed and when working on the car..


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