Please Help Distributor Question

My question is I have a 1929 Model a engine with from what I can tell is a original distributor but on one side there is a black wire coming out the one side of the distributor base were there is a hole that looks to be original but over sized I have searched and searched to see what the wire could connect too could some one help it is probably something simple sorry no pics my car is under a pile of snow at this point Merry Christmas and Happy new year to everyone
Stumped in Windsor Ontario Canada

 

This might help?
https://www.google.com/search?q=mod...AhXDyVQKHfyxDPYQ9QEIKzAA#imgrc=7hvrypF7xAtRoM:

 

Looking at the picture this wire is coming out 2inchs left on base of the cable

 

i found this pic it is the wire coming out of distributor????

 

From the link Budget36 posted comes this link http://modelabasics.com/Ignition.htm
That pretty well explains the Model A ignition system.

 

See far left

 

Big Help thx