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Old 09-27-2019, 12:26 AM   #16
Mike Beck
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Default Re: MSD kill switch

Either open the small red wire which is simply the on/off switch for the box, no current through it, or keep the white wire grounded, then there will be NO spark. I would chose to put the switch on the red wire myself, SMALL red wire!
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Old 09-27-2019, 01:30 AM   #17
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Default Re: MSD kill switch

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Originally Posted by vegaman924 View Post
you want to kill the power in not out ,you will hurt the box by gounding the coil ,the red wire is the one to kill power to

The problem with grounding the coil is that there is very high voltage pulses on that terminal, and it "might be" that a switch won't put up with that, or may intermittently arc over, causing missing etc
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Old 09-30-2019, 06:07 PM   #18
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Default Re: MSD kill switch

Thanks guys for the replies so far,,,, do I get it right that to cut the small red wire from the box and putting in a switch enabling that circuit to be opened and closed will achieve what I ask and cause no issues or damage?
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Old 09-30-2019, 06:57 PM   #19
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Default Re: MSD kill switch

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Originally Posted by desoto30 View Post
Thanks guys for the replies so far,,,, do I get it right that to cut the small red wire from the box and putting in a switch enabling that circuit to be opened and closed will achieve what I ask and cause no issues or damage?
That wire should at the moment be wired to the ignition or on switch you have. So it already gets turned on and off.

Breaking that circuit with an extra switch is just like turning the ignition off, it wont damage anything. It will just turn the MSD off like MSD intended.
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Old 10-01-2019, 07:17 PM   #20
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Thank you, ^^^^ and thanks to all that contributed,,,, I am a wiring moron, but I fully understand what you have said and now am sure of how to proceed ...Thnaks again guys
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Old 10-01-2019, 08:15 PM   #21
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Default Re: MSD kill switch

Wires to the coil on MSD are orange and black, the power/ arming wire is a small red one the
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Old 10-04-2019, 06:58 PM   #22
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On the Box??? yes? thankyou... you can't be too careful with this black magic stuff lol
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Old 10-07-2019, 12:25 AM   #23
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Default Re: MSD kill switch

well guys I just finished installing a switch on the red wire near the box,,, the ignition switch now as before lights up the red led on the box showing there is power supply to the box,,,, Now when I open circuit the switch on the steering wheel, the box turns off just like it does with the ignition switch ,,, It works like I think it should, So I am believing all is well Thanks for the help everyone
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Old 10-15-2019, 05:34 AM   #24
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Default Re: MSD kill switch

and now have tested and all is A1 thx guys
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Old 10-15-2019, 06:14 AM   #25
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Default Re: MSD kill switch

https://forums.holley.com/showthread...ht=kill+switch

You can ground the magnetic trigger purple from MSD
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Old 10-27-2019, 12:29 PM   #26
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Here's how we do it in the Nascar industry. It was mandated in the early 2000. Some will run the ignition wire though a steering wheel mounted switch. The only problem here is if the wheel is disconnected or the wiring fails the ignition will not operate. A jumper will be required for the ignition to function. What we always did was ground the white points wire. This will kill the ignition but it will be functional with the wheel removed or if the wiring breaks. It can also be done by grounding the tach wire.
Hope this helps.
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Old 10-27-2019, 05:38 PM   #27
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Default Re: MSD kill switch

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Originally Posted by RaceWireTech View Post
Here's how we do it in the Nascar industry. It was mandated in the early 2000. Some will run the ignition wire though a steering wheel mounted switch. The only problem here is if the wheel is disconnected or the wiring fails the ignition will not operate. A jumper will be required for the ignition to function. What we always did was ground the white points wire. This will kill the ignition but it will be functional with the wheel removed or if the wiring breaks. It can also be done by grounding the tach wire.
Hope this helps.

But that is not "fail safe" If the wiring/ contact breaks and you NEED to kill the engine, the safety switch will not function.
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Old 10-27-2019, 08:17 PM   #28
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When it comes down to hundreds of thousands or millions, what would you prefer to fail. Your ignition, or a safeguard that may not be needed in the end?
In professional racing, the system is tested weekly multiple times and prior to each run and checked off.
Your ball
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Old 11-07-2019, 06:08 PM   #29
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Default Re: MSD kill switch

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Originally Posted by RaceWireTech View Post
Here's how we do it in the Nascar industry. It was mandated in the early 2000. Some will run the ignition wire though a steering wheel mounted switch. The only problem here is if the wheel is disconnected or the wiring fails the ignition will not operate. A jumper will be required for the ignition to function. What we always did was ground the white points wire. This will kill the ignition but it will be functional with the wheel removed or if the wiring breaks. It can also be done by grounding the tach wire.
Hope this helps.
I did ground the white wire,,, but in my case for whatever reason the engine continued to run and would not shut off??? IDK
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Old 11-08-2019, 07:02 PM   #30
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Quote:
Originally Posted by desoto30 View Post
I did ground the white wire,,, but in my case for whatever reason the engine continued to run and would not shut off??? IDK
I don't know what to tell you. We built 100s of harnesses and cars this way not only with one box but 2 each car. All were bench tested and live tested and worked flawlessly.
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