Russell wrote:
Hi,

I wonder if anyone can help?

I have recently bought a campervan based on a Fiat Ducato chassis. It
has a three pin diagnostic connector. I have an interface that uses
the standard 16 pin plug for use with my car. Does anyone know if it
is possible to make or buy an adaptor to use with the Fiat?

Russell.

Almost certainly. IIRC most connectors are actually serial links.