master cutoff

Stocker · 12-06-2011, 02:41 PM

In rulebook,general regulations: The cutoff switch must be connected to the positive side of the electrical system. What difference if it on the negative wire?

Thank!

buzzinhalfdozen · 12-06-2011, 02:51 PM

Theory seems to be in a crash anything metal that contacts ground lug on battery completes the path.By isolating pos. theres nowhere for power to go... in theory. This is how it was explained to me.Joe

Run to Rund · 12-06-2011, 04:30 PM

Unlike NHRA, we know the electrons flow from the anode (-) to the Cathode (+). Since we can't teach that pig to sing, we deal with it. To protect the alternator diodes, run the feed right to the battery or the battery side of the cut off switch. For 60 amps and a lead 20' long, 4 gauge will work; crimp and solder the ends for acceptable electrical contact. Run the MSD power right to the battery to protect it. The trigger wire will go through the switched power so that will shut off the engine if NHRA just has to see if the switch shuts the car off.

12-06-2011, 02:41 PM	#1
Stocker Junior Member Join Date: Nov 2003 Location: Canada Posts: 35 Likes: 0 Liked 0 Times in 0 Posts	master cutoff In rulebook,general regulations: The cutoff switch must be connected to the positive side of the electrical system. What difference if it on the negative wire? Thank!

12-06-2011, 02:51 PM	#2
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: master cutoff Theory seems to be in a crash anything metal that contacts ground lug on battery completes the path.By isolating pos. theres nowhere for power to go... in theory. This is how it was explained to me.Joe __________________ Joe Buchanan SS/BX 3117

12-06-2011, 04:30 PM	#3
Run to Rund Senior Member Join Date: Sep 2007 Location: Henderson, NV Posts: 583 Likes: 8 Liked 54 Times in 27 Posts	Re: master cutoff Unlike NHRA, we know the electrons flow from the anode (-) to the Cathode (+). Since we can't teach that pig to sing, we deal with it. To protect the alternator diodes, run the feed right to the battery or the battery side of the cut off switch. For 60 amps and a lead 20' long, 4 gauge will work; crimp and solder the ends for acceptable electrical contact. Run the MSD power right to the battery to protect it. The trigger wire will go through the switched power so that will shut off the engine if NHRA just has to see if the switch shuts the car off.