Greetings.  I, too am dealing with wiring in a Fiberfab MIGI.  I don’t believe I’ll need to replace the whole harness, but I do have a couple leads on sources for you.  Custom Wiring (http://www.customwiring.com/hotrods.html) says they have a harness for VW MGTD’s.  Another forum member also suggested Painless Wiring, Centech and Ron Francis. 
Best of luck.

Thanks for the input, Pink. 
Another source for a harness is American Auto / Marine Wiring, http://www.customwiring.com.  They have a harness specifically for the MIGI, as well as for a number of other TD replicas and kit cars.  I may eventually buy a complete harness, but first I would like to assess how much of the old wiring is bad.  I’d also like…[Read more]

I just started the resurrection process on a MIGI with a fried wiring harness.  I, too, would like to know where to get a wiring diagram.  Maybe also a complete wiring harness. 
Thanks.