Cut off question

C

ColinR

Member
Hi guys,

Got my cut off switch this morning :thumbs: and have a question.

For the Ignition Coil and Switch connections am I just splicing into them, or am I completely re-routing the ignition switch to coil wire through the cut off?

I suspect I already know the answer, but wanted to double check.

Cheers,
Colin
 
To be honest with you I'm not entirely sure. For the past season mine has just intercepted the battery cable in the boot right next to the battery with an aditional pull switch in the cabin. I haven't read the regs fully yet, do they say that this isn't acceptable?
 
Okay, The terminals labelled as '1' are for the pulldown resistor, -this is going to drain off any residual charge in the car's circuits once you've opened the big MOFO isolator, so you just need to put a link wire in from the secondary side of the big (10mm?) terminals to the little spade terminal on the 2ndry side of number '1' terminals. on the other side link the resistor down to any chassis earthpoint or make one yerself. this stops the alternator diodes from blowing if you shut it off via this switch.

The number '2' terminals open at the same time as you open the big MOFO switch, and open-circuit the LT of the ignition circuit. Either cut into the ignition control wire on the ecu or direct into the ignition wire from the key barrel. this makes sure the engine doesn't 'run-on.'

So, Big cable (+ve) across main nut and bolt terminals.

resistor to ground on one side of '1' terms and cable link from other side to secondary big beefy cable (use any size cable for this, a bit of 2.5 would be the go if you have it) - the linked wire should go on the alternator/starter side and not the battery side.

then just to break into the ignition circuit and connect across terms '2' , just use a bit of cable, 2.5 again if you have it (sorry, i'm not up on wire gauge sizes)

About the only concerns you may have with this installation are devices--radio, clock, thermostat-controlled fans, or alarm--that require a continual power supply. Such garb can be wired directly to the battery through a separate circuit if you so desire.

as for the regs, it doesn't mention it, but I'm sure FIA regs specify this arrangement as a minimum so it all works as it should - it would be a bit of a pisser if the engine set alight cos it run for a moment too long ;)
 
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So, just to confirm, when you say "break in" you mean splice or am I actually completely reruiting the Ignition Switch to Ignition Coil wiring?

i.e:
cutoff.jpg


Where 2 is the ignition switch - coil wire that used to run straight down as a complete circuit and 1 is looped power and earth through the resistor?

Phil? I take it you've never killed your alternator from switching?

Colin
 
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Ok im sounding dumb as hell here, but Im confused with all this break in, splice, etc and aint sure if we mean the same things.

By splice I mean run in parallel, to the existing lines:

ie, I spliced the wires onto my ECU for my Bee*R, AVCR, TT, etc as I just exposed a little wire and soldered.

Sorry for all the questions, but I like to get things right first time, specially when I need my car daily and can't afford to make mistakes and have the car not running.

Thanks again,
Colin
 
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no problem mate. you need to actually cut the wire, and put a connector on each end, then connect to the switch.

diagram below..
cutoff.gif
 
guys guys guys, sorry to be completly thick as fcuk but as any one got any pics of these done cos you may aswell speak in some complete bo****ks lanuage as me understand all that splice, link 1,2 secondary stuff.

unfortunatley i need to seeing where things go and come from. that is what i will do if i ever get my head around it. i am sure its simple to most of you guys but its blagging my head and the more i read of various methods the worse i get.

sorry to be a pain in the ass
 
That's my old diagram I made for someone. The blue and yellow wires are cut into the original ignition wire to the ignition barrel. Turning the cut off key will have the samebeffect as turning off the ignition key. Make sense?
 
I think so basically your adding the cut off switch into the circuit. Eg cut the ignition wire and connect one end to '1' and the other end to the '2' right?
 
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