Ignition switch

Hi, i have to replace my ignition switch,the problem is somebody has cut off the plug and fitted a seperate switch on the dashboard.
Does anybody know which colour wires go to which pole on the original switch.

Ready  

should be numbers and letters on back the switch

30 = red

15 = black

50 = red black x2 [joined]

x = yellow black

p = grey

30= battery live supply

15= power supply [ignition on]

50= starter solenoid and ignition power [cranking]

x= spare ? Goes to wiper switch ?

p= parking light switch

 

get back any problems ! This is for 1983 GTI but should be the same for all models .

Cheers ……….