[Mike Kelly]

Hi Jim

Could be for headphones/mic for the driver and his mate.... with a 19 set installation, the intercom may have been in use ?

I suggest you contact Andrew Tostevin in Adelaide, he is well clued up on the C15 Wireless ( Aust.) . He knows the ins and outs of them intimately.

I guess you have the storage diagram.. it details the various equipment layouts for different wireless sets - 101, 112, FS6, 19, 22 etc.

Mike