Sorry for reasons unbeknown to me I thought you had a mk2 for a while there. Best thing to do it grab a voltmeter which allows you to identify whether the wire currently exists if not then look at making a new connection. You need to identify you constant and switched. Constant will be identified by looking for a 10v or higher voltage whilst the car is off. The switched will be identified by the same process but with the ignition on keep in mind the fact that constant will also be on at this point so be mindful.
