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So NHRA says the cut off must shut off the car when the switch is off. How do you do this? I tried to just run off the + side but when the car is running the car will not shut off, if you turn the switch off. Help!
battery cut-off
So NHRA says the cut off must shut off the car when the switch is off. How do you do this? I tried to just run off the + side but when the car is running the car will not shut off, if you turn the switch off. Help!
go to WWW.NHRA.com for the rules and how they want it done..
The alternator red feed wire must be included in the shut off loop to kill the engine too as I recall.
07 Hoss
Originally Posted by vtecthis349pony
Leave the battery in the front. Problem Solved.
Sold
2004 Cobra, Whipple ,TH-400
Burning Corn
9.97 - 135.5
OK thanks HOSS! thats how you do it.... Jeff me and jr found a great spot to mount the battery cut off. no cutting!
An alternative method is to cut into the ignition instead of the power from the alternator output. Installing a relay in the coil feed line that is controlled by the cut off switch will accomplish the same thing, kill the motor.
The biggest reason for doing it this way is that this circuit is a low power one as opposed to the high power/amperage of the alternator output. It is much easier to control. It requires only one small wire run to the engine compartment to operate.
The down side is that you are adding a additional component to the already complicated ignition system.
It works and I have been using this system for several years without a poroblem.
I should add that this is done in conjunction with the battery cut off switch and uses a 4 pole switch instead of a normal 2 pole battery switch. Cole Hersey makes them.
Dana
'03 Redfire Coupe 6 spd 10.54@133.5
Whipple tuned by HBH, BilletFlow stuff (and Doug didn't even ask me to post that), Raptor Shift Light, Solid Axle w/3.73, etc, etc, etc...
The Fuse Box on the Driver Side will kill the entire car. Not the Red Wire, but he Gray Wire.
The 4 tracks ive been too never even tested my kill switch on the Mach.
ha ha ha ha ....
this is JR's car.. he is super anal........ we move the battery and the heat exchanger res. in back... and poly. bushings in the irs. JR spent 2 day's running the line to the front of the car. and we only get about 5 hours each day.
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