Killswitch

AtomicX · 05-05-2010, 02:38 PM

Hey I have my battery relocated to the trunk and the drag way I go to told me that I need to have a kill switch when running a battery mounted in the rear. Whats the best way to wire the kill switch?

Redog · 05-05-2010, 06:05 PM

I would say between the battery and the altenator and a fuse. Just use the correct gauge wire. (8 gauge I think)

jabartram · 05-05-2010, 07:29 PM

from the battery to the kill switch, kill switch to the starter. they need to be able to disconnect in case of accident.

Redog · 05-05-2010, 08:22 PM

Why to the starter.

I thought it did nothing after the car was running

clutch1 · 05-05-2010, 08:40 PM

How about this...

Chassis > Bolt > Wire > Killswitch > Wire > Negative battery post

Simple enough..

AtomicX · 05-05-2010, 09:42 PM

Quote:

Originally Posted by clutch1

How about this...

Chassis > Bolt > Wire > Killswitch > Wire > Negative battery post

Simple enough..

Dragway said it needs to be on the positive terminal to disconnect the alternator.

I was thinking of this, positive feed from engine bay to the switch, then from the switch to the positive terminal on the battery.

jabartram · 05-05-2010, 09:59 PM

Quote:

Originally Posted by AtomicX

Dragway said it needs to be on the positive terminal to disconnect the alternator.

I was thinking of this, positive feed from engine bay to the switch, then from the switch to the positive terminal on the battery.

basically they need to be able to kill the power to the vehicle in the case of an accident or emergency, which means kill the switch kills the power to the vehicle.

on older vehicles the alternator wire was either strait to the battery or to the starter.

[ion] C2 · 05-05-2010, 09:59 PM

Quote:

Originally Posted by AtomicX

I was thinking of this, positive feed from engine bay to the switch, then from the switch to the positive terminal on the battery.

yep you just need to break the circuit

AtomicX · 05-05-2010, 10:02 PM

Now any ideas where to mount the switch?

jabartram · 05-05-2010, 10:05 PM

it needs to be easily accessible at the rear of the vehicle if i remember correctly.

Blackjack should have one, hopefully he will chime in.

AtomicX · 05-05-2010, 10:12 PM

Having it the way I said it would definitely disconnect the alternator as well?

jayson_waltz · 05-05-2010, 10:37 PM

^yea, just put in inline on the wire that goes from the alt to the battery. done.

BlackJack · 05-05-2010, 11:20 PM

Doesn't really matter about whether it's positive or negative really. I just ran battery neg/switch/bumper bracket. Really if you lose your ground, your computer dies = no ignition = engine dies = alternator stops making juice = no electrical. However, in any case I'd follow the guidance of the track officials, because they're the ones to tell you to "get your effing car outta here" instead of giving you the thumbs up.

Oh, and for location, I mounted mine in the back bumper on the upper slope just below the trunk.

wrestlingandrunning · 05-06-2010, 01:29 AM

I have two battery's but a circuit breaker. Do you guys think that is well enough, because I would like to get some practice going down a drag strip before I get my z going.

AtomicX · 05-06-2010, 09:49 AM

Quote:

Originally Posted by BlackJack

Doesn't really matter about whether it's positive or negative really. I just ran battery neg/switch/bumper bracket. Really if you lose your ground, your computer dies = no ignition = engine dies = alternator stops making juice = no electrical. However, in any case I'd follow the guidance of the track officials, because they're the ones to tell you to "get your effing car outta here" instead of giving you the thumbs up.

Oh, and for location, I mounted mine in the back bumper on the upper slope just below the trunk.

The reason they wanted me to use the positive is because it ensures the deactivation of the alternator exciter wire.

So would the setup like I said earlier work to shut off everything?

Positive feed going into trunk to the switch, then from the switch to the battery in the trunk.
Also can I get a picture of your switch on your bumper blackjack?

cherrington17 · 05-06-2010, 01:08 PM

Quote:

Originally Posted by AtomicX

The reason they wanted me to use the positive is because it ensures the deactivation of the alternator exciter wire.

then they don't know how electricity works. I know you need to follow their rules (like bj said) but if there isn't a full circuit, then there is no power anywhere.

cutting power or ground, cuts electricity as a whole.

AtomicX · 05-06-2010, 02:13 PM

Quote:

Originally Posted by cherrington17

then they don't know how electricity works. I know you need to follow their rules (like bj said) but if there isn't a full circuit, then there is no power anywhere.

cutting power or ground, cuts electricity as a whole.

I have two grounds, one ground under the hood thats grounded to the frame (the grounds that went to the old battery under the hood), and a ground on the battery in the trunk going to the frame.

BlackJack · 05-06-2010, 06:28 PM

yeah, here it is. Sorry the trunk is open, but it's offset to the passenger side. You should be able to see the "Moroso" label in red on the bumper.

Redog · 05-06-2010, 06:45 PM

A little OT but I was wondering if I could put one of those in, just like that, under the dash for a kill switch so the car won't start?

wrestlingandrunning · 05-06-2010, 07:11 PM

Quote:

Originally Posted by Redog

A little OT but I was wondering if I could put one of those in, just like that, under the dash for a kill switch so the car won't start?

Yep you can, I'm going to put in a fuel pump relay switch hidden in my car.