if i wire it inline with the battery(in the hatch) then it wont kill the car when the alternator is powering it. How do I wire it in to kill everything?

 

do a search...it was covered on a huge thread in this forum like a month ago.

 

i saw that thread,pretty useless when it came down to the facts on how to wire it...jared..eventho if you hate mustangs with a passion,you GOT to pick this months edition of 5.0 Mustang, (i believe it has a red stang on it with white stripes on cover but not sure,i dont have it with me now,left it at work ) it has one of the greatest tech articles in it covering cut-off switches ive ever seen! you just cant wire a cutoff switch like you do a race car that doesnt have a alternator,you got to use relays or else once you use the cutoff switch,it can cause a big voltage spike which will fry your alternator! you got to pick up that mag! it really goes into detail.



[Modified by D-Man, 11:25 PM 8/20/2002]

 

what i did was throw a toggle switch in between one of the wires that plugs up to the alternator(cant remeber which one it is right now). When ever i get to the tech area, i just flip the switch and when they hit the cut off switch the whole car shuts off. hope this helps u out some.
manny

 

Hah... Technically that suggestion is totally not legal.

Here is how we did it on the CRX. Basically we run heavy gauge wire (like a 4ga), with a fuse, from the battery to a post in the engine compartment. From there we run it to the starter.

We then took a smaller gauge (I think 8ga) and ran it from the battery (actually the fuse) to the switch on the back of the car, and then ran it back from there to the fuse block in the engine compartment. Then we physically cut the bus (with a cut-off saw) to isolate that first fuse such that we could install a switch.

Ah damnit. THis is from memory, and I think if we're talking about wiring diagrams, I had better diagram it out and take some pictures.

But the basic jist of it is that we're putting the switch in at the input fuse on the fuse block in the engine compartment. The starter still has juice straight from the battery, but the starter solenoid has none when the cut-off switch is off, so it can't start--it cuts all power from the system basically.

I'll get some pictures and diagrams up here shortly.

All because the Honda alternators have built-in voltage regulators and you can't just do the alternator field disconnect trick.

-k


[Modified by rotten, 11:40 PM 8/21/2002]

 

OK.. the way I did it was pretty simple.. I have an aftermarket ignition system.. So basically.. I tapped the switch in the ignition system to cut the power to the dist. coil... So.. that kills the car if it's running.. Not sure if that's regulation or not, but a track official told me to do it that way.

Not sure if regulation requires that all power to the vehicle be completely shut down, but that's how I setup mine.

 

lol.. that post was too damn confusing. And i did answer his question.

 

can the master cutoff switch be located in the engine bay if the battery has been relocated to the rear?

 

no, has to be in the back of the car. Kinda sucks for street cars.

 

***whistles and rolls eyes***

 

i dont even think people with "race cars" would want to have the battery in the rear of the car.

 

we dont want the battery in the back, but the cutoff has to be on the rear of the car. The battery in our car is under the hood, but the cutoff is still in the back.

 

All I did when I hooked up mine was took the power cable from the battery box(at the rear) to the switch, then ran the cable from the switch to the engine bay.
Not sure if thats the correct way to everyone else but thats how I did it.

 

that looks like it works, but the alternator will keep the car running...

 

great, there's no way i'll be able to run a disconnect switch back there, I already wired up the cables and everything. How about running the master switch back there, putting a relay that will cut the fuel pump off when the switch is off?

 

https://honda-tech.com/zerothread?id=368990
from the Auto x/ road race section y0...

 

you can run the kill wire on the alt. along with the main power cable to the switch so it will kill both the alt. and battery.