immobiliser fitting

[gt]

i need to fit an immobiliser as i'm running a megasquirt so the stock one isn't there anymore ,bought a cobra 8510 which has two circuits to immobilise, i would have normally used the feed to the fuel pump and the other i would have used is the feed to the coils.
the problem is my car is running coil over plugs which are wired straight from the megasquirt and are wired in pairs so even if i cut one of the wires there it would probably still start but on two plugs, someone suggested the starter wire from the ignition barrel which i would be happy with but the wire looks fairly heavy duty and the wires from the immobiliser are not so I'm worried something might melt if i did it this way.
the only other circuit i can think of is maybe the power wire that feeds the ecu ,anyone any idea if this would be ok or any other suggestions please.

[ferny]

Control the ignition circuit with a relay controlled by the immobiliser?

[composimmonite]

Do Cobra have an advise / technical line for their products ?
cobracartech.co.uk/9-alarms-and-immobilisers?gclid=CMmH3LLS7cwCFcE_Gwodr3AAPA

[gt]

i might try giving them a call in the morning, i did ask on another forum and was told all immobolisers come with the same gauge wiring and would be ok for the starter circuit ,but i,m not so sure.

[neilclark]

It's the wire from ignition switch to starter you cut not 12v supply at starter. Also cut the earth to the fuel pump not the live, old school trick was to run a wire from rear lights to fuel pump then turn lights on and drive car away!

[gt]

yes it's the wire from the ignition switch i was going to cut ,i was still worried that the wires from the immobiliser wouldn't handle the current ,the manual says: max engine cut relays current 10a cont/ 20a for 3sec is that enough.

[neilclark]

May 22, 2016 22:43:21 GMT gt said:

yes it's the wire from the ignition switch i was going to cut ,i was still worried that the wires from the immobiliser wouldn't handle the current ,the manual says: max engine cut relays current 10a cont/ 20a for 3sec is that enough.

Should be fine, only a trigger wire

[joffturbonova]

I would do live to the ECU and fuel pump (earth) both of which are lower amp circuits than the starter motor trigger or ignition switched from the ignition barrel.

No live to the ECU = no sparks , no fuel = not going anywhere .

And if you are really concerned get a GPS tracker too.

Joff

[gt]

cheers ,gone for the feed to the ecu it's in a much harder place to get to and like you say doesn't draw as much current so i'm happy with that.