Triplett Fox & Hound 3 – PN: 3397 - Manual (Page 33)

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At the other end of the wires, connect one of the clips of the
FOX to a good earth ground. Experimentally connect the other
clip of the FOX to one wire and then the other, while listen-
ing to the tracer tone on this clip with a HOUND 3. If the
level of the tracer tone drops significantly when the clip is
connected to one of the wires, this wire is probably OK and
the other wire is open. That is, the open wire is the one that
doesn’t drop the level of the tracer tone. If neither wire drops
the level of the tracer tone, they are probably both open (or
a good ground has not been used).
Leave the clip connected to the wire or wires that do not
“load down” the tracer tone. See Figure 6. Using a HOUND
3, follow the path of the wires by finding the strongest sig-
nal. An abrupt drop in the tracer tone level will occur at the
point of the open. Keep in mind, however, if tracing unseen
wires in the wall or ceiling, that the wires may pass behind a
metal object (like a furnace duct) that prevents the HOUND
3 from picking up the tracer signal, or the wires may diverge
from the path of the receiver. Before assuming that the open
has been located, try finding the signal nearby or in an adja-
cent attached wall or ceiling. Also keep in mind that it may
not be possible to find the open in all situations, because of
the number of variables involved.
Helpful Hints:
If attempting to trace a telephone wire terminated in a modu-
lar jack, but not connected to the telephone company, through
a wall or ceiling, insert the FOX’s modular plug into the jack,
and then connect either the red or green clip lead to a ground