Triplett Hound 3 – PN: 3392 - Manual (Page 37)

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If there is an EOL resistor on the line, it may be necessary to
remove it for True Trace to work. To find out if the EOL needs
to be removed, turn on the FOX 2, set it to TRACER TONE,
and connect it’s clips to the wires. While listening to the FOX
2’s pilot tone, short the clips together several times, noting
whether the cadence changes. If it does, the EOL can be left
on the line. If the cadence does not change, the EOL must be
removed.
7.2.12: Miscellaneous Multiwire Cables
Some general principles are important to keep in mind when
locating and tracing wires and cables.
Any wire with a signal on it, which runs parallel to another
wire or wires tends to couple its signal to the other wires.
The closer the wires are together, and the longer the parallel
run, the more signal that is coupled. This situation occurs in
multiwire cables, and when cables are bundled together when
installed.
Luckily, if the other wires are low impedance (they have loads
on them), the coupled signal will be lower in level. So, in
general its best to disconnect the cable being traced from
its loads, leaving other paralleling cables still connected to
their loads. If the other cables do not have loads (like when
they are being installed), it helps to temporarily connect one
end of the cable to earth ground, so that they do not inter-
fere with the trace.