What's the difference between a KG 13A and a KG 13B

Long time since my last post. I recently got asked what the difference between the KG 13A and KG 13B was. Externally, both were identical (with the exception of some smaller details like data plates and casting features depending on the manufacturer). The difference was the internal wiring only. Let's have a look at the wiring diagram that was glued to the inside of the wiring cover. First a KG 13A:

3) KG 13A WIRING DIAGRAM

2) KG 13B WIRING DIAGRAM

3) KG 13A WIRING DIAGRAM (Used in a Fw 190 instead of a KG 13B)

The only difference is an additional connection from 5 to the A-button in the KG 13B compared to the KG 13A. The third example above was installed in a Fw 190. Fw 190s were usually fitted with KG 13Bs, but in this example the internal wiring of a KG 13A was modified to reflect the diagram of a B. 

The Bf 109 usually had a KG 13A (or C in very late war production aircraft) and the Fw 190 usually a KG 13B (or C in very late war production aircraft). But there were exceptions and both aircraft types are known to have used both KG 13As and Bs.

I hope this clarifies some questions. If you have any control stick for identification, I'd like to hear from you. Please contact me (via this blog or via my website www.vintageeagle.com).