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Old 03-26-2019, 07:12 AM   #21
Myron Piatek
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Post 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
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Old 03-26-2019, 07:28 AM   #22
Ernie Neal
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Default Re: Master Cutoff Switch

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Originally Posted by J&S Racing View Post
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
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Old 03-26-2019, 08:02 AM   #23
Jon Sarrett
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Default Re: Master Cutoff Switch

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Originally Posted by J&S Racing View Post
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.
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Old 03-26-2019, 08:40 AM   #24
Ed Carpenter
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Default Re: Master Cutoff Switch

Travis, I’m guilty of not having mine labeled. Thanks for the reminder, I will address it.
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Old 03-26-2019, 12:06 PM   #25
FireSale
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Default Re: Master Cutoff Switch

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Originally Posted by Jon Sarrett View Post
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.
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Old 03-26-2019, 02:25 PM   #26
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Default Re: Master Cutoff Switch

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Originally Posted by FireSale View Post
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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