"DP" wrote in message
...
Isn't the needle supposed to point "toward" the NDB?
the head was acting more like a VOR head in the from position.

When I bought my airplane, the ADF had a similar problem. An NDB that was
30 degrees to the right would cause the ADF to indicate 30 degrees to the
left, for example. Right and left were reversed.

In that case, it turned out that someone incompetent had worked on the
avionics and all sorts of wiring was screwed up. The main problem was that
a couple of wires were hooked up wrong. I don't recall the exact
configuration, but it involved the nav indicator illumination power wires.
I think maybe one of the power wires had been incorrectly connected directly
to ground, shorting out the circuit and causing weird behavior from the ADF
(as well as disabling the VOR indicator illumination).

The local avionics shop was able to diagnose and fix the problem relatively
quickly. No permanent damage had been done to any of the avionics, so all
they had to do was fix the wiring. If you have a wiring schematic you can
reference, it should be easy enough to double-check all the hook-ups. If
not, if it were me, I'd take it to an avionics shop and let them fix it.

But George's suggestion sounds plausible enough, so you might try reversing
the connections to the indicator first, if you want to save a few bucks (I
don't have the bill in front of me, but if I recall, the work to fix mine
was "only" a few hundred dollars...spare change for avionics work around
here).

Pete