nasty9er

I am in the middle of hooking up a street use (not for track) kill switch to my batterys Negative. The switch i am using is a 300 amp switch with 1/4" wide post. Wanted to know what size wire would be best for this application? I am only using the switch for theft/storage and to kill the car when working on it.

i was told 4awg would be fine but it seems to small to me so i was going to go with 2awg.

i am running it from the bat to the glove box so we are only talking a few feet so price of wire does not matter.

any input would help....

xsbank

Check out the Blue Seas marine electrial site, they have a chart for load/length/voltage drop/gauge tables that are very useful. I believe they are in Seattle.

ramius665

Check with JohnKoaWood, he's got some pretty impressive solutions for a great price.

nasty9er

http://forums.clubrsx.com/showthread.php?t=787105

this is what i am going to be doing and that is the same switch style that i am using

i dont need a kit or any thing like that

all i wanted to know is what size wire would work and should i use a fuse and if so what size

keep in mind this is for the negative terminal

MAGK944

You don't need a fuse on the ground (negative) side. Have to ask why put it on the ground side? The grounds on our cars can be very temperamental, I consider them a maintenance item. If you do it that way make sure you get a good quality switch that doesn't introduce any resistance there when it is closed.

Personally I would put it in the traditional positive side. Positive kill switches generally have a set auxiliary contacts where you can wire up your alternator exitor wire, radio, alarm, clock and central locking. This ensures those systems will remain functional when the kill switch is open. Otherwise you will always be coding your radio, setting your clock, etc. Just something to think about.

nasty9er

i already have a disconnect on the negative termanal so i really dont mind having my radio and clock reset i just dont want to have to open the hood every time

i already have the switch installed i was just trying to find out a good size for the wire i guess i will just go with 2awg

MAGK944

You don't even need wire, why not just use ground braid.

xsbank

Lazy... here you are Recommended Wire:

AWG 2/0

Capacity per ABYC Standards: 316 amps.

The wire you select must be large enough to meet both ampacity and voltage drop requirements. These are the wire sizes this circuit needs to meet each requirement:
Ampacity (Additional Derating Factors): Ampacity (ABYC Standards Only): Voltage Drop (ABYC):

No Additional Derating Factors were entered.

AWG 2/0

AWG 3

UltimatE157

Erm, 2/0 ? 2/0 is massive. The stock ground wires are 4 gauge I believe.

A 2 gauge wire should be good. Where is this switch located? Length will play a factor in size.

nasty9er

thx i tried that site but didn't get anywhere with it






the switch is mounted inside the glove box so i will only need about 3 feet or less to get to the battery

UltimatE157

Yeah so basically its right on the other side of the firewall from the battery. Very short run. 2 gauge is fine.

xsbank

2 gauge is good for 200 amps.

nasty9er

going to pick up some 2 awg today going to see if they can crimp 2 end on it for me

ill have to post some pics soon

924-76

I did mine few years ago:http://www.924board.org/viewtopic.ph...ghlight=switch

Good luck

JohnKoaWood

@240vac....