Generally the starter wire on most aftermarket alarms gets cut and rerouted through the alarm unit to kill the ignition.
Essentially I would be looking for two wires with the same color scheme that are disconnected and reconnect them together if they are the identical color scheme.
I'm not sure on the wire coloring, but I suspect that is where the ignition kill problem is if its an aftermarket alarm that you pulled out.
They generally just clip the starter wire and then it runs to an in wire and an out wire to complete the circuit when the alarm is disabled. and breaks the circuit when the alarm is engaged.
Hope that helps in your search.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.