On Wed, 04 Nov 2015 17:08:07 -0600, dpb wrote:

On 11/04/2015 4:49 PM, dpb wrote:
...

Wind has gotten up and it's supposed to perhaps rain tomorrow so I ran
the lift back in...looks like next step is to do a resistance check on
that run but I'll have to get back up to the top to do it...

Actually, as another mentioned earlier in the other thread, simplest
diagnostic here is probably to just run a temporary direct wire back
from the breaker box neutral to the connection at the weatherhed
bypassing the other box and existing wire altogether.

Yep, I said I did this when my garage neutral had a problem. Assuming
your meter pole is not too far away, get a piece of #12 wire (or larger)
and connect it to the neutral in the meter pole main box neutral bar.
Run it to the weatherhead cable on the barn. Wrap it well around the
support wire. Turn on the power and check if you now have 120 - 0 - 120
using a few lightbilbs for a load. If it works, you know the problem is
between the meter pole and the weatherhead. If not, connect that wire
directly into the barn breaker box. If it still dont work, you have a
problem in that breaker box. You could also run that wire from the barn
weatherhead to the breaker box to see if the problem is between the
weatherhead and breaker box.

Of course this is only temporary and not for loads over 20A.