I want to test a 2km (1.6mm dia) steel wire that runs around a =
residential home for continuity.

There are several wires parralel to each other, but aren't connected =
together. All the wires are tightened to wooden poles - no isolators.

I was thinking of connecting a 12V power supply on the one end. The =
other end I want to connect to one of the PIC's pins. (through voltage =
devider or what ever...)

It must use relatively little current (powered by a 12V battery) and =
must be robust agains lightning.

Can someone help me with connections.

Must I use optocouplers, MOV's or Transorps

Regards

Francois
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