vauhaul corsa classic 2004 ignition

Which wire can I use for the ignition wire on the corsa classic as it have a transponder key module where the ignition wires should be.I'm fitting an alftermarket alarm on my friends car.I got my chassis,constant but I'm not sure about the ignition wire.Mr signal

Corsa classic vauxhaul 2004 south africaMr signal

Black, either at switch or main loom behind glovebox going into engine bay. Warning, test there's at least one thick one that's constant 12V+ not ignition. That same loom, behind the support tube behind the glove box will also give you lock unlock, starter, 12V+ constant and ground (earth). Indicators may be, otherwise, left hand floor loom and possibly trunk trigger.

Thanks Howie,I saw that wire yesterday,will test and use it todayMr signal