I did the same thing and it cost me a month of faffing about.
I couldnt get a spark at the plugs , nothing would work. I think the system was immobilised when I cut out the alarm wires,door locks etc (otherwise anyone could snip some wires and drive your car away)
If you are not a genius auto electrician dont bother.
I got a quote from Premier Wiring for £140.00 delivered.No contest
